# SecretPang: a Korean store coach who turned his course on cutting wasted Coupang ad spend into a ₩59k/month tool · Chrome extension

> Source: https://stringers.io/en/ext/chrome_mgdmlcadikhkifpkcleedjckibbefemm.html (Stringers / 什么值得做, generated 2026-11-08)
> Stringers answers one question every day: what small product can one or two people build in a few months and actually make money from. Numbers come from 15 databases we collect daily, each with source and date.
> For agents: these verdicts and the underlying databases (verified revenue, App Store / Google Play charts, ad libraries, GitHub, Product Hunt…) are queryable live over MCP — tools today / hot / products / directions / direction / data. Setup: https://github.com/komako-workshop/stringers (the user logs in at stringers.io → "配置 agent" to get a personal URL). Site index: https://stringers.io/llms.txt

> Coupang's flagship AI auto-ads spend money where clicks are high and sales don't follow. The company behind it is the e-commerce education brand 시크릿크루; its courses teach the demand side thoroughly, and members, YouTube viewers, and referral links turn directly into paying users.

[Chrome extension](https://stringers.io/en/ext/index.md) · written 11-6

시크릿팡 - 쿠팡 광고효율 높이는 셀러 도구 · secretpang.kr

# SecretPang: a Korean store coach who turned his course on cutting wasted Coupang ad spend into a ₩59k/month tool

**What it is** A Chrome extension companion to secretpang.kr, a web tool for Korean Coupang sellers to optimize ads. It automatically finds keywords and products wasting money, writes negative keywords and bids back into the Coupang back end, and costs ₩29k to ₩109k per month.

**Why it's taking off** Coupang's AI auto-ads push spend toward clicks that don't convert. The company behind it is Secret Crew, an e-commerce education brand. Its course explained the need clearly, and members, YouTube viewers, and referral links turned directly into paying users.

**C** **How you could follow this** If you have an audience of sellers, you could build a "find the waste, write it back in one click" tool for platforms that don't offer ad APIs, such as Shopee or Naver Smart Store, in the local language. Build the content and referral business first, then the tool. Without an audience, don't bother.

Grade C: it depends on an education creator's existing audience and paid community, which followers can't copy. Korean Coupang ad tools are already crowded, and this one has only 325 users, so it's small. What's worth learning is the two plays of "course plus execution tool" and "using the logged-in session to write back into the back end". Chatter in small circles

325 users

SecretPang is a Chrome extension with only 325 users. It helps Korean Coupang sellers find keywords and products in their ad spend that get clicks but no sales, and removes them from the ads in one click. The user count is small because only paying or trial accounts can use it. It's worth watching for the person behind it rather than the features: a Korean e-commerce educator, "정다르크", and his company. The course teaches you how to do it, the tool does it for you, and the students are ready-made customers.

### Red cup and yellow cup

2025 year Apr 7, an account called 「셀러브리핑」 (@seller.briefing) on Threads posted a thread titled 「쿠팡 AI광고 돈만 빨아먹는 이유」 (Why Coupang's AI ads just suck your money). It gives an example: you sell a red cup and a yellow cup. Lots of people click the yellow one but never buy; fewer click the red one, but those who do buy. Coupang's AI sees the yellow cup getting clicks, so it gives it more exposure and spends more of your ad budget on it. The post also says: 「쿠팡은 광고비를 많이 소진시키는게 이익이라 그렇겠지」, meaning Coupang profits when you burn through more ad spend.

The next post explains how to check: download your daily Coupang ad report, upload it to 시크릿팡, and it lists the product options that spend money without selling anything. You exclude those and you're done. The link is `secretpang.kr?ref=thr`. Signing up through it gives one free month, and after that, 1 ad campaigns are free forever. The post has 454 views. The `ref=thr` on the link is a channel tracking tag, so this account is most likely run by the company itself (inference).

At the time, it was a web tool where sellers had to download the report and upload it themselves. 15 months later, it got a Chrome extension.

### What it is

Coupang has been pushing sellers toward automated AI ads (「AI 스마트광고」「매출최적화」). That saves sellers effort, but the AI tends to put money into keywords and product options that get clicks and zero sales. To stop the bleeding, you used to have to download the ad report, build pivot tables in Excel, pick out the wasted keywords one by one, and manually enter them into Coupang's 「제외 키워드」 (excluded keywords). In 2025 July, a Tistory blogger wrote up this process: 「Download the report, open it in Excel, build a table, run a pivot, write formulas, find the keywords with lots of clicks and no sales, and exclude them one by one. It's a hassle and takes a lot of time.」

시크릿팡 automated this work. The homepage (11-06) lists these features:

- Automatically finds the keywords and options wasting money, and excludes them from Coupang ads with one click;

- Manages bids for manual ads, and shows whether sales went up or down after changes;

- Factors in ad-spend VAT and coupon amounts to show your real net profit;

- Automatically compares against last week and the same period last year, and alerts you when performance starts to drop;

- Every morning at 8 o'clock, sends yesterday's ad spend, sales, and ROAS via KakaoTalk, plus which campaigns are burning money.

The extension launched in 2026 July 26. Coupang doesn't open an ad API, so outside tools can't change a seller's ad settings directly. They can only piggyback on the seller's own logged-in browser session to read and write. The extension does exactly that: it syncs data between the 시크릿팡 site and the seller's own logged-in Coupang seller back office and ad center, then writes exclusions and bids back to Coupang. The store description says it only runs when the seller initiates an action in 시크릿팡 and does not collect Coupang account passwords. Since November, it can also read reports from the Naver advertiser center (ADVoost, 카탈로그). Three months after listing, the version has reached 0.0.109 (11-04 updates), and it keeps changing.

|  | Metric | Sources |
|---|---|---|
| users | 325,0 ratings | Chrome Web Store, 11-01 |
| Growth | 9-01 about 210,11-06 about 334 (+59%) | Third-party extension stats |
| Launched | 2026-07-26 | Chrome Web Store |
| Version | 0.0.109,11-04 update | Chrome Web Store, 11-06 |

### Who's behind it

The terms of service and privacy policy for 시크릿팡 name the operator as (유)정진 (Jeongjin Co., Ltd.). The footer of 시크릿크루, a Korean seller education membership community, also says Jeongjin Co., Ltd., with CEO Kim Jin Young. They are the same company.

시크릿크루 背后是「정다르크」,她的 YouTube 频道「돈버는 비밀, 정다르크」有约 11.4 万订阅,多年来一直教人在쿠팡 和 스마트스토어 上开店。2024 年 7 月她发过一条「쿠팡 광고 이렇게 돌리면 큰일납니다」(쿠팡 广告这样投就完了),讲自动广告怎么设置、排除词怎么分析,有 13.3 万播放。也就是说,需求早在工具出来之前就已经由课程讲透了。시크릿크루 会员年费 99 万韩元,这批人本来就是愿意花钱学开店的卖家。10 到 11 月,시크릿크루 的会员问答区里已经有人在问 시크릿팡 怎么用。社群顺带做了客服。

### Where users come from

- **Its own audience and members** : the YouTube channel and 시크릿크루 members. The course teaches the method, and the tool is the next step. This is its main source of users.

- **Referral commissions** : the terms of service include a clause that pays members who refer customers 「income,」 and mention withholding tax and invoicing. The Tistory blogger above ends the post with: 「I wrote this after actually using it. If you sign up through the link above, I earn a small commission.」 Early on, 시크릿크루 had its students bring in people through 「제휴링크」 (affiliate links), and now the same setup applies to the tool.

- **Threads content accounts** : the red cup post from the start, tagged with `ref=thr`.

- **PDF lead magnets** : a FlipHTML5 account under Jeongjin posted 「쿠팡 광고 pdf (리뉴얼 시크릿팡 업데이트)」.

- **Paid ads** : the privacy policy says hashed emails and phone numbers are sent back to ad platforms to check whether the company's online ads drove sign-ups and payments. So they at least plan to advertise, but I couldn't find where.

The Chrome Web Store doesn't bring in customers by itself; it's just an install point, with 0 ratings and no push for users to leave good reviews. No one has mentioned it on X in nearly 90 days, and no media has covered it. The people who know about it are basically limited to this small circle of Korean seller education.

### Where the money comes from

The money isn't in the extension, it's in the website subscription. Three tiers, all at annual prices:

| Tier | Monthly (billed annually) | What you get |
|---|---|---|
| 초보 | 29,000 KRW | Analyzes 10 ad campaigns, with exclusion keyword management, bid management, and net profit calculation, but changes have to be pasted back into Coupang yourself |
| Junior (marked 「Popular」) | 59,000 KRW | 30 campaigns; **automatic sync to Coupang** (exclusions, bids, coupons); KakaoTalk daily report; staff sub-accounts |
| 고수 | 109,000 KRW | 100 campaigns, more sub-accounts |

14 days of full-feature free trial. After that, you can keep analyzing 3 campaigns of your choice for free, but automatic collection stops and you have to upload the Excel report yourself. This free tier is cleverly designed: the analysis is still available, but you keep uploading files by hand, and the automation is what you pay for.

The extension is only useful at Junior tier and above, so the 325 extension users are roughly the paying Junior/Senior accounts plus trial accounts. By rough estimate, that's several million to 20 million won a month (about $2,000–14,000, inferred; no public revenue figures). It's a real business, but not a big one.

The homepage shows before-and-after screenshots from three sellers: ROAS going from 1,266% to 2,496%, from 282% to 498%, and from 306% to 611%. The last seller's weekly ad sales went from 810k to 7.1M won. There's also a testimonial: 「Out of 1,000 keywords, I only adjusted the bids on 40, and I moved to the top of the ads.」 For sellers, the ad spend they save in a month can cover the subscription fee. The math is clear, so they're willing to pay.

### Who it's competing with

| Competitors | Scale | How 시크릿팡 differs |
|---|---|---|
| Coupang's built-in AI ads and exclusion features | All Coupang advertisers | The platform's goal is for you to spend more; 시크릿팡 sells 「don't trust Coupang AI completely」 |
| 빅셀(BigCell) | 2025-02 reports 4,000 member companies | Coupang one-stop operations: it manages ads, rankings, profit, and budgets, with broader coverage than 시크릿팡 |
| 세이비(Savey)AI | Not verified | Also does automatic exclusions and cuts money-burning products, with the pitch 「1,000 won a day」 |
| 마켓콕 소싱 | Not verified | Chrome extension, ad analysis plus product selection |
| 쿠파일럿, 대시판다 | Not verified | Leans toward product selection and data dashboards |
| 셀러라이프, SMART DATA, 판다랭크, 불사자 | 70k / 30k / 10k / 6 thousand users | Product and keyword tools; they don't change the ad back end |
| Free Google Sheets and Excel templates | Free | Same idea, all manual |

「Coupang ad analysis」 is already a crowded little niche in Korea, and 시크릿팡's features have some equivalent at most other tools. It managed to grow because of a seller group that already trusted it. The features themselves aren't the reason.

### If it were you

**C: The playbook is worth studying, but don't copy the product.** 시크릿팡 took off because of 정다르크's decade-plus of accumulated seller audience, its ₩990k member community, and its referral system, none of which copycats can get. Korea already has a string of Coupang ad tools like 빅셀 and 세이비, and 시크릿팡 itself has only 325 extension users.

**Who it suits** : people who already have a seller audience, such as e-commerce course teachers, seller community operators, or cross-border service providers, and who understand a platform's seller back end technically. It also suits people who can find a market where 「the platform doesn't open an ad API and sellers are wasting money.」

**Who it's not for** : developers with no audience who expect store search and features alone to bring in users. These B2B tools get no organic traffic in the store, and 325 users and 0 ratings are the evidence. Also, if you're thinking of building another 쿠팡 ad tool for Korea, that space is already crowded.

**How to do it:**

- Pick a market where the main platform pushes 「AI auto-placement」 but its seller back end doesn't open an ad interface, and do the same thing in the local language: find the wasted keywords and products, and write them back to the back end with one click. Options to consider include the seller back ends of Naver Smartstore, Shopee, Lazada, Temu, and TikTok Shop (verify which platforms lack an open API before starting). Amazon's ad API is open, and tools there are already a red ocean. Skip it.

- Build a web SaaS as the core, with a Chrome extension only reading and writing the back end using the seller's logged-in session. Charge via website subscriptions, tiered by the number of ad campaigns managed.

- Follow its free-tier approach: give analysis away for free, and charge for automatic sync.

- Show before-and-after ROAS screenshots from real seller back ends on the homepage. That's how tools like this close sales.

**How to get users** : content first, then the tool. Use 「the platform's AI is wasting your money」 as a topic for YouTube and Threads, with easy-to-grasp examples like the red cup and yellow cup. Negotiate referral commissions with teachers of local shop-opening courses and seller community operators, so their students sign up through your referral links. If you don't have your own audience, borrow someone else's.

**When to move early** : don't rush around a milestone. The real deadline is the day the platform opens its ad API, or the day it builds exclusion features itself. After that, the extension's write-back step stops being valuable.

**What would show you're wrong** : (1) 시크릿팡's extension users hit 2027 in the first half of 2,000, which shows this type of tool can grow big without an education brand, so it's worth reconsidering; (2) a similar product with no education background reached several thousand users on another platform (like Shopee), showing that 「copy it to another platform」 can work; (3) conversely, if Coupang opens an ad API or changes its back end so the extension sync breaks, the technical foundation of this approach is gone.

[Chrome store page ↗](https://chromewebstore.google.com/detail/%EC%8B%9C%ED%81%AC%EB%A6%BF%ED%8C%A1-%EC%BF%A0%ED%8C%A1-%EA%B4%91%EA%B3%A0%ED%9A%A8%EC%9C%A8-%EB%86%92%EC%9D%B4%EB%8A%94-%EC%85%80%EB%9F%AC-%EB%8F%84%EA%B5%AC/mgdmlcadikhkifpkcleedjckibbefemm)

**Research notes: competitor table, acquisition evidence, full research report**

Competitors

| Name | Where | Launched | Scale | How it differs from this one |
|---|---|---|---|---|
| Coupang AI 스마트광고 / 매출최적화 + exclusions | Big-company features | Years ago | All Coupang advertisers | The platform's own optimization goal is to spend more ad money; 시크릿팡 sells standing on the seller's side, cutting the waste from Coupang AI |
| 빅셀(BigCell) | Web | 2024 years ago | 2025-02 reports 4,000 member companies (livesnews) | Coupang one-stop operations management; 시크릿팡 only does ad-waste exclusion and bidding, backed by an education brand |
| 세이비(Savey)AI | Web | About 2025 | Unverified; has Naver blog posts and openads sponsored content | Also auto-excludes keywords and cuts money-burning items, pitching a low price of 1,000 KRW a day; 시크릿팡 costs more and leans on community trust |
| 마켓콕 소싱 | Chrome | Not verified | Not verified | Ad analytics plus product and keyword research; broader coverage |
| 쿠파일럿 / 대시판다 | Web | 2025–2026 | Not verified | Focused on product selection and data dashboards; ad optimization is just one part |
| 셀러라이프 / SMART DATA / 판다랭크 / 불사자 | Chrome | 2022–2024 | 70k / 30k / 10k / 6k users (chromestore) | Product and keyword research tool; doesn't write to the 쿠팡 ad backend |
| Free Google Sheet / Excel templates (e.g. the 돈 먹는 키워드 색출 sheet) | Other | 2024–2025 | Free | Same analysis approach, but done by hand; no auto-sync or write-back |

Where users come from

- **Confirmed** **Founder IP and paid community (정다르크 YouTube, 시크릿크루)** : 시크릿크루's footer says Jeongjin Co., Ltd., 시크릿팡's terms say (유)정진, same company; the channel has about 114k subscribers and the 쿠팡 ads video has 133k views; members ask 시크릿팡 usage questions at secretcrew.kr/qa/167104

- **Confirmed** **Referral commissions and affiliate blogging** : the terms of service include a clause paying referring members; borntoexplore.tistory.com/2056 reviews the product with ref=wl7xJY and discloses that it earns a commission

- Inferred **Threads content account** : @seller.briefing posts pain-point content on 2025-04-07 with the link secretpang.kr?ref=thr, 454 views; likely an official owned account

- **Confirmed** **PDF and ebook lead generation** : a FlipHTML5 account under Jeongjin posts 「쿠팡 광고 pdf (리뉴얼 시크릿팡 업데이트)」

- Inferred **Paid ads and conversion feedback** : the privacy policy states that sign-up and payment data from online ads is hashed and sent back to ad platforms; not indexed in our metaads library, and specific campaigns were not found

## 시크릿팡 (SecretPang): a Chrome extension that companions a 쿠팡 seller ad-optimization SaaS

- Extension ID: mgdmlcadikhkifpkcleedjckibbefemm; first published on the store 2026-07-26, version 0.0.109 (2026-11-04 update), 325 users, 0 ratings (chromestore library 2026-11-01 snapshot; store page 2026-11-06 read)

- Website: [secretpang.kr](https://secretpang.kr), operated by **(유)정진 / Jeongjin Co., Ltd.** (secretpang.kr/terms, /privacy)

### Bottom line

It did not grow up on the store. It is a **self-built SaaS** from the company behind 정다르크 (YouTube 「돈버는 비밀, 정다르크」, about 114k subscribers), a Korean e-commerce education influencer. Her paid membership community 시크릿크루 (990k KRW per year) and 시크릿팡 are **the same company, (유)정진** . Traffic comes from the seller audience she built over years, the membership community, and referral commissions with ref tags; the extension is just the vehicle for the SaaS feature that auto-syncs to 쿠팡. The user count is small (325) because only paying or trial accounts need to install it.

### 1. What it is

- Pain point: 쿠팡's 「AI 스마트광고 / 매출최적화」 auto ads spend money on keywords and options (SKUs) that get clicks but zero sales. Sellers had to download ad reports, build pivot tables in Excel, find the wasted keywords, and enter them manually as 「제외 키워드」 (excluded keywords) in 쿠팡. The official site says 「about 38% of 쿠팡 ad spend is wasted on keywords that bring 0 KRW in sales」.

- Features (official site): automatically finds wasted keywords and options and excludes them in one click; manages manual ad bids; calculates true net profit (counting ad fees, VAT, and coupon amounts); compares against last week and the same period last year; sends a daily ad summary via KakaoTalk 알림톡 at 8 every morning.

- What the extension does (store description): syncs sales and ad data between the seller's own logged-in 쿠팡 seller backoffice, the ad center, and the 시크릿팡 web app, and writes exclusions and bid changes back to 쿠팡; since 2026-11 it can also read Naver ad manager (ADVoost / catalog) reports. It only runs when the user initiates a request and does not store 쿠팡 account passwords.

- Pricing (official site, annual billing): Beginner 29,000 / Intermediate 59,000 (popular tier, includes 「쿠팡 auto-sync」) / Advanced 109,000 KRW per month; 14-day full-feature trial. After the trial ends, up to 3 chosen ad campaigns can still be analyzed for free, but the user must upload the Excel report themselves. **Auto-sync is only on Intermediate and above** , so the extension serves paying and trial users at Intermediate and above.

### 2. Timeline

| Timeline | Event | Sources |
|---|---|---|
| 2024-07-22 | 정다르크 posts the YouTube video 「쿠팡 광고 이렇게 돌리면 큰일납니다」 (133k views), covering auto-ad setup and excluded-keyword analysis, to educate demand first. | youtube.com/watch?v=H4ACrpkBY8E |
| 2025-04-07 | The Threads account @seller.briefing (셀러브리핑) posted 「쿠팡 AI광고 돈만 빨아먹는 이유」, directing readers to upload their daily reports to 시크릿팡; the link is `secretpang.kr?ref=thr` (a channel-tagged link, likely an official owned account). At that time the product was still in the 「upload Excel report」 form, with 1 months of free sign-up and 1 ad campaigns free forever. | threads.com/@seller.briefing/post/DIJjN4FzjS4 |
| 2025-07-30 | A Tistory blogger wrote a 「시크릿팡 beta」 review, explicitly saying 「I earn a commission if you sign up through my link」, with the link `?ref=wl7xJY`. | borntoexplore.tistory.com/2056 |
| About 2026-01 | Jeongjin's FlipHTML5 account posted 「쿠팡 광고 pdf (리뉴얼 시크릿팡 업데이트)」, using the PDF as a lead magnet. | online.fliphtml5.com/jeongjin/tsta/ |
| 2026-07-26 | Chrome extension launched, upgrading from 「manual Excel upload」 to 「auto-sync and write-back to 쿠팡」. | Chrome Web Store |
| 2026-09 to 2026-11-06 | extops readings: 2026-09-01 has 210 users, 11-06 has 334 users (about +59%); the store page shows 325 (11-01). | User counts cited in the recall card come from extops; chromestore item_snap. |
| 2026-10~11 | Usage questions such as 「시크릿팡 문의」 show up in the 시크릿크루 member Q&A, so the product's support and community are linked. | secretcrew.kr/qa/167104 |

### 3. Competitors

| Product | Form | Launched | Scale | How 시크릿팡 differs |
|---|---|---|---|---|
| 쿠팡's built-in AI 스마트광고 / 매출최적화 and negative-keyword features | Big-company features | Has existed for years | All Coupang advertisers | The platform's own optimization goal is to get sellers to spend more on ads. 시크릿팡's entire pitch is 「don't trust 쿠팡 AI blindly」, positioning itself on the seller's side. |
| 빅셀(BigCell) | Web SaaS | 2024 years ago | 2025-02 reports 4,000 member companies | 쿠팡 all-in-one operations (ads, ranking, profit, budget automation), 「built by a 100 100-million-won seller」; broader coverage, while 시크릿팡 focuses on the single problem of wasted ad spend. |
| 세이비(Savey)AI | Web SaaS | About 2025 | Unverified; Naver blog posts and openads sponsored content exist | Also does 「remove money-burning products」 and auto-excludes keywords, pitching a low price of 「1,000 KRW a day」; 시크릿팡 costs more but has the backing of an education brand |
| 마켓콕 소싱(marketkok.co.kr) | Chrome extension + web app | Not verified | Visible on the store; user count unverified | Ad analytics plus product/keyword research; 시크릿팡 focuses more on ad exclusions and bid write-back |
| 쿠파일럿 (coupilot.net), 대시판다 (dashpanda.io) | Web SaaS | 2025~2026 | Not verified | Focused on product selection and data analysis; ad optimization is just one part |
| 셀러라이프 / SMART DATA / 불사자 / 판다랭크, etc. | Chrome Extension | 2022–2024 | 70k / 30k / 6k / 10k users (chromestore) | Product, keyword, and competitor analysis tools; they don't write to the ad backend |
| Free Google Sheet templates (「돈 먹는 키워드 색출 시트」), Excel analyzers on YouTube | Template | 2024–2025 | Free | Same analysis approach, but done by hand; no automatic write-back |

Bottom line: there are plenty of similar tools; 「쿠팡 ad analysis and optimization」 is already a crowded niche in Korea. 시크릿팡 doesn't win on features alone.

### 4. Growth tactics (evidence)

1. **Founder IP and own community (confirmed)** : 시크릿크루's footer reads Jeongjin Co., Ltd. | CEO: Kim Jin Young | help@secretcrew.kr; 시크릿팡's terms of service and privacy policy are also (유)정진. 정다르크's YouTube channel has about 114k subscribers, and her 쿠팡 ads special videos have 133k views. Members ask 시크릿팡 usage questions directly in the 시크릿크루 Q&A. This audience already paid 990k KRW to learn to sell online, so willingness to pay has been proven.

2. **Referral commissions (confirmed)** : the terms of service include a clause paying referring members 「수입」 (earnings), with withholding tax and invoicing; a blogger reviews with `?ref=wl7xJY` and discloses earning a commission. 시크릿크루 used 「affiliate links」 to get students to refer others from early on (YouTube has videos like 「정다르크 시크릿문서 제휴링크로 9만9천원 돌려받기」), and the same playbook was moved onto 시크릿팡.

3. **Threads content account (likely)** : @seller.briefing uses the `ref=thr` channel tag to post pain-point content (「쿠팡 AI는 안 팔리는 상품에 돈을 더 써」), with 454 views.

4. **PDF and ebook lead generation (confirmed)** : a FlipHTML5 account under Jeongjin posted 「쿠팡 광고 pdf」; 정다르크 mentioned a PDF book in video comments, free for members.

5. **Paid ads (intent confirmed, campaigns not verified)** : the privacy policy says that online ads run by the company that lead to actual sign-ups and payments are tracked, with hashed emails and phone numbers passed to ad platforms, which indicates conversion feedback. Our metaads library doesn't index it, which doesn't mean it isn't advertising.

6. **Chrome Web Store search** : the store is an install point, not an acquisition channel. 0 ratings, and there is no push for reviews.

### 5. Why it took off

- **The demand is platform-made** : 쿠팡 pushes sellers toward AI auto-ads, and the auto-ads waste money (sellers say things like 「I trusted AI and only burned through ad budget」). That creates a lasting pain point that can be measured in money. The site sells on before-and-after ROAS screenshots (e.g. from 306% to 611%, weekly ad sales 8.7x), so the ROI is clear and the subscription fee is easy to justify.

- **Near-zero acquisition cost** : the audience, trust, and support community already exist, built by 정다르크 over a decade of seller education. This is the 「education brand extends into a tool」 playbook: the course teaches the method, the tool executes it, and members and tools can cross-sell.

- **Upgraded from Excel upload to extension auto-sync and write-back** : 쿠팡 has no open ad API (reads and writes rely on the browser's logged-in session), so an extension is the only way to offer 「one-click exclusion, one-click bid changes」. After the extension launched on 2026-07, users grew from 210 to 334 (extops), and versions iterated quickly to 0.0.109, which shows it is actually being used.

- But by scale, its traction is limited to a very narrow Korean B2B circle: 325 extension users, roughly the paying and trial accounts at Intermediate and above. A rough estimate of tens of millions to 20 million KRW per month (unverified, pure guess) makes it a small but real business.

### 6. Differentiation

- On the product side: it focuses only on the single problem of 「wasted keywords and options」, plus **writing changes back to 쿠팡** (exclusion and bid sync), calculating true profit including VAT and coupons, and daily KakaoTalk pushes. Similar features exist in 빅셀 and 세이비, so none of it is unique.

- The real differentiator is **distribution and trust** : a tool built by a seller-education brand, where the member community doubles as support and word-of-mouth, plus referral commissions. That is why it got traction, not the features.

### 7. Visibility

- No public revenue (not on TrustMRR; the founder has never shared numbers). Not found on X (x-radar, 90 posts in 0 days). No media coverage. What's visible online is its own channels (Threads, PDFs) and one or two commission-driven sponsored posts.

- Bottom line: **it's circulating in a small Korean seller circle** , and almost nobody outside knows about it.

- Copycats: none spotted yet; similar products (세이비, 마켓콕, 빅셀) are independent competitors.

### 8. What to borrow

- "Education content + paid community + a SaaS that does the work": courses sell the method, the tool sells execution, and repeat purchases and ticket size both go up.

- When a platform has no open API, use a Chrome extension that borrows the user's own logged-in session to read and write the backend. The same approach transfers to Naver 스마트스토어, Shopee, Mercado Libre, Temu seller backends, and Amazon's smaller-language stores.

- Ad copy that plays on an us-vs-them feeling, "the platform's AI is wasting your money," paired with before-and-after ROAS screenshots.

- Free-tier design: after the trial, keep 3 ad campaigns free but require manual Excel uploads, using the hassle to push users to upgrade to auto-sync.

### 9. Uncertain

- Paying users and revenue: unverified. The extension user count is only a lower-bound reference.

- Whether a 2021 kmong outsourcing project titled "시크릿팡 제작" (PHP plus the Coupang API, client "정인") was a predecessor of this product: can't confirm.

- Whether it runs ads on Meta, Kakao, or Naver: the privacy policy implies ad intent, but no specific campaigns were found.

- Whether 정다르크 personally promoted 시크릿팡 in his videos: I did not check the 2025–2026 videos one by one.

### Sources

- [secretpang.kr/](https://secretpang.kr/), /terms, /privacy (read 2026-11-06)

- Chrome Web Store page (read 2026-11-06); chromestore library item / item_snap (2026-11-01)

- [secretcrew.kr/](https://secretcrew.kr/) footer; [secretcrew.kr/qa/167104](https://secretcrew.kr/qa/167104); [secretcrew.kr/qa/166268](https://secretcrew.kr/qa/166268)

- [www.threads.com/@seller.briefing/post/DIJjN4FzjS4](https://www.threads.com/@seller.briefing/post/DIJjN4FzjS4)

- [borntoexplore.tistory.com/2056](https://borntoexplore.tistory.com/2056)

- [online.fliphtml5.com/jeongjin/tsta/](https://online.fliphtml5.com/jeongjin/tsta/)

- [www.youtube.com/watch?v=H4ACrpkBY8E](https://www.youtube.com/watch?v=H4ACrpkBY8E); dolearn.ai channel page (127k subscribers, older data)

- [livesnews.com/mobile/article.html?no=48238](https://livesnews.com/mobile/article.html?no=48238) (one of 4,000 member companies of 빅셀, 2025-02-19)

- [blog.naver.com/moonkra7/223958289850](https://blog.naver.com/moonkra7/223958289850) (세이비)

- [kmong.com/portfolio/view/216867](https://kmong.com/portfolio/view/216867)

This article was written by AI from public data and the data we collect daily. Numbers are sourced, and inferences are labeled.