81 transactions prove demand — but this one is not a solo side business
A listing that sells AI model design and implementation as project work. It has the strongest demand evidence in this list (81 transactions, 100% satisfaction) and the lowest replicability. It is a two-person company with a floor price near ₩800,000. Read it as proof that money moves in this market, not as a side-hustle template.
- Founder
- StellaDev (Stella Dev Co., Ltd.)
- Country
- KR
- Team
- 2
- Startup cost
- —
- To first revenue
- —
- Automation
- low
- Reported revenue
- Revenue not disclosed
What is sold
Project work — a floor price plus surcharges by data type
From ₩800,000 · 14-day turnaround · 2 revisions. Data types beyond text and images carry a surcharge. Checked 2026-08-15.
Who buys
Companies and teams that need an AI capability built; client names appear in the portfolio
AI's part and the person's part
Already had
MSc from a university AI lab, former researcher at KAIST, former R&D at a large Korean tech group's AI division. The profile states two programmers, both with master's degrees.
If this is large, the AI is not the reason
What the AI did
Selects a model for the client's problem, implements it from the literature, builds training data where needed, and runs training and validation. The portfolio includes a deep-learning demo mobile app and a motion-recognition model.
the part a tool replaced
What the person did
Requirement analysis and model selection are effectively the whole job. What is sold here is not tool operation but knowing which approach to use.
stories that omit this do not replicate
How customers were found
Kmong — marketplace search placement
Portfolio with client names
Platform-assigned senior seller level
Paying customers
From ₩800,000 · 14-day turnaround · 2 revisions. Data types beyond text and images carry a surcharge. Checked 2026-08-15.
Flow: Kmong — marketplace search placement, then Portfolio with client names, then Platform-assigned senior seller level, then Paying customers
How we verified this
Public dashboard or platform figure. May be self-reported
Checked the Kmong listing directly on 2026-08-15. Platform-displayed values — 81 completed transactions, 100% satisfaction, 31 reviews averaging 4.9, corporate account. The profile states two programmers, so this is not a one-person business. No revenue figure is published, so we print none. ⚠️ The 81 transactions are the seller's total, not this listing's.
- Kmong listing — transactions, satisfaction, team composition, floor price (marketplace · checked 2026-08-15)
What made it work
The use of this case is the price floor, not the playbook. Eighty-one completed transactions at a floor of ₩800,000 with a 14-day turnaround says demand exists at that band. Put next to the two cheaper cases in this list, the shape of the Korean AI-services price range starts to show.
Risks
⚠️ Lowest replicability in this list. The research and industry track record is the product. ⚠️ Two people, so it is not evidence that one person can do this. ⚠️ A 14-day engagement is hard to run alongside a full-time job — unlike the 3-to-7-day chatbot case.
Does this work in Korea?
A domestic company selling on a domestic platform, so it transfers directly. Corporate buyers effectively require tax invoices, which in turn requires business registration.
Solo-feasible: no · Automation: low
7-day action plan
Step 1. Do not copy this one. Instead list only the services in the same category with a turnaround of three days or less
Step 2. Write down that list's price distribution and find the band you could enter
Step 3. In one sentence, write what separates the ₩800,000 listing from the ₩150,000 one
30-day action plan
Step 1. Buy or at least request a quote from three of the cheapest listings in your band
see what is actually delivered
Step 2. Pick the one point where you could do better
Step 3. List a service covering only that point. Do not widen the scope
Run the numbers
We do not print a single projected figure here. Put your own numbers in instead.