Seonin is a personal AI studio, founded in 2026 and operated by Minjun Gu in Seoul. We build and ship autonomous multi-agent AI products on Anthropic Claude — software where agents plan, generate, and verify, and a human approves every release.
| Company | Seonin — personal AI studio |
| Founded | 2026 (Seoul, South Korea) |
| Operator / Founder | Minjun Gu (구민준) |
| Domain | seonin.online (registered via Cloudflare, valid to 2027) |
| Company email | [email protected] · [email protected] (on-domain, live MX) |
| Hosting | Cloudflare Pages + Pages Functions (serverless), KV storage |
| Core model | Anthropic Claude (Opus / Sonnet / Haiku) — production agent pipelines |
These are not planned — they are shipped and running today. Claude drives the reasoning of every pipeline.
Serialized manga produced end-to-end by AI agents: Claude writes continuity, scripts, and prompt specifications; ComfyUI (Krea2 / Anima / Hassaku) renders each panel; Qwen reads faces for expression QA; Claude rewrites failing prompts. Real episodes, page by page.
Long-form fiction with continuity: 36-beat story planning, chapter outlining, drafting, and a multi-pass editing gate. Claude keeps style, characters, and plot state tracked across an entire book.
| Comic Studio | Episode 151 in production — pages 16–24 lettered and shipping, pages 25–26 in the QA loop (1 panel cleared 4/4 on pass 2 in the record above; failing prompts are rewritten by Claude, then re-rendered on a fresh seed). |
| Novel Engine | Chapter 3 approved after seven documented passes (10,471 characters, 39% dialogue, restricted-term scan clear) — reverse design, voice lock, continuity ledger, human gate. |
Seonin exposes a public, documented API. You can verify real usage right now:
GET https://seonin.online/api/view → real-time product usage counters (KV-backed):
{"site":0,"comics":0,"novel":0}
Also: POST /api/view?key=… (increment), POST /api/access (early-access queue with 6-digit verification), GET /api/admin (authenticated). Full endpoint map in /llms.txt.
Anthropic Claude (Opus / Sonnet / Haiku) is the reasoning core across all three products. Seonin runs multi-agent pipelines on Cloudflare Pages + Functions with Workers KV persistence, calls Claude for planning, prompt-writing, and structured judgment, and layers open image/diffusion models (ComfyUI) for rendering. Human-in-the-loop QA gates every published release.