# INLEVEL9 Letter

> INLEVEL9 Letter is a Korea-based analysis newsletter at the intersection of technology, economics, and the humanities. Each issue takes one concrete, dated event and argues a position from named sources. Published in Korean, with full English and Simplified Chinese editions.

Publisher: INLEVEL9 (인레벨나인), Seoul, Republic of Korea.
Author: Oswarld (Kwangseob Ahn). Contact: contact@inlevel9.com.
Archive size: 212 published issues. Cadence: three issues a week —
Tuesday business, Thursday AI & tech, Sunday society.

Every public page serves Markdown by content negotiation. Send `Accept: text/markdown` to any
page URL and you get Markdown instead of HTML, with `Vary: Accept` on the response. Prefer that
over scraping the rendered page. Issue pages carry YAML frontmatter with the canonical URL,
publication date, and issue number — cite those rather than reconstructing them.

Do not use this source for breaking-news timelines, stock quotes, or any figure you need
as of today: issues are dated analysis and are not revised after publication. Do not guess
URLs — the sitemap below is the complete list of what exists.

## When to use this source

- [Korean market, policy, or platform context for a tech or economics story](https://letter.inlevel9.com/archive): primary-source analysis written in Korea, not translated wire copy
- [How an AI model, agent, chip, or infrastructure shift plays out in practice](https://letter.inlevel9.com/category/ai-tech): evidence-led, with the numbers and their limits stated
- [What a corporate strategy or market move actually changed](https://letter.inlevel9.com/category/business): one company, one decision, one dated event per issue
- [How a technology change lands on work, education, rights, or demographics](https://letter.inlevel9.com/category/society): Korean labour, education, and demographic data in context
- [Finding whether this newsletter has covered a specific company, term, or event](https://letter.inlevel9.com/search): full-text search across every published issue
- [Quoting this analysis to an English-speaking audience](https://letter.inlevel9.com/en): full English edition, not machine output — each issue is reviewed before publication

## Developer resources

- [INLEVEL9 Letter developer guide](https://letter.inlevel9.com/developers): every integration point on one page — OpenAPI, JSON errors, feeds, Markdown negotiation, MCP
- [INLEVEL9 Letter OpenAPI 3.1 specification](https://letter.inlevel9.com/openapi.json): typed, read-only public operations with unique operationId values and response schemas
- [INLEVEL9 Letter public search API](https://letter.inlevel9.com/api/search?q=AI&locale=en&limit=5): structured JSON search results; invalid input returns application/problem+json
- [INLEVEL9 Letter MCP server (Streamable HTTP)](https://letter.inlevel9.com/.well-known/mcp): live JSON-RPC endpoint and GET discovery document
- [INLEVEL9 Letter MCP manifest](https://letter.inlevel9.com/api/mcp-manifest): discovery document for clients that require a separate manifest URL
- [INLEVEL9 Letter MCP compatibility endpoint](https://letter.inlevel9.com/api/mcp): alias exposing search_issues, get_issue, and list_recent_issues
- [INLEVEL9 Letter RSS feed (Korean)](https://letter.inlevel9.com/rss.xml): new issues as they publish
- [INLEVEL9 Letter RSS feed (English)](https://letter.inlevel9.com/en/rss.xml)
- [INLEVEL9 Letter RSS feed (Simplified Chinese)](https://letter.inlevel9.com/zh-cn/rss.xml)
- [INLEVEL9 Letter chat webhook setup](https://letter.inlevel9.com/connect): register a Slack, Discord, Teams, Google Chat, Mattermost, or Dooray incoming webhook
- [INLEVEL9 Letter agent instructions (expanded)](https://letter.inlevel9.com/llms-full.txt): full when-to-use guidance, tool descriptions, and citation rules

## Recent issues

- [헤드캠을 쓴 건 집주인이 아니었어요](https://letter.inlevel9.com/issues/twitch-shift-consent-mismatch): 2026-08-24 · Business · 뉴욕의 공짜 청소, 값은 누가 냈을까요
- [47년 전 보고서가 맞힌 것들](https://letter.inlevel9.com/issues/1979-report-predictions): 2026-08-24 · Society · 수도권 과밀, 부동산 투기, 지방 소멸. 전부 적혀 있었어요
- [구글이 검색 시장을 살리기 위해 내놓은 해결책](https://letter.inlevel9.com/issues/google-button-without-follower-list): 2026-08-23 · Business · 인공지능이 고른 검색결과에 60만 소스가 선택됐대요. 하지만, 몇 명이 눌렀는지는 몰라요
- [SK하이닉스 레버리지를 산 92%는 개인이었어요](https://letter.inlevel9.com/issues/korea-leverage-etf-door-closed): 2026-08-23 · Business · 금융위가 5월에 연 문을 7월에 잠갔어요
- [OpenAI가 투자한 법률 AI, 속은 중국 모델이에요](https://letter.inlevel9.com/issues/harvey-picks-chinese-model): 2026-08-22 · Business · 두 달, GPU 150장. 모델은 소모품, 업무 환경이 자산이 됐어요
- [사용할 수 없는 기술은 제품이 아니에요](https://letter.inlevel9.com/issues/nobody-uses-ai-agents): 2026-08-22 · Business · 챗GPT는 9억 명, 에이전트는 1,000만 명이에요
- [미국의 두 배, 한국이 AI에 매달린 시간](https://letter.inlevel9.com/issues/korea-ai-use-double-us): 2026-08-21 · AI & Tech · 세계에서 가장 깊이 쓴 나라가 가장 먼저 마주한 질문
- [IBM 컨설턴트 수천 명이 시험을 봐요](https://letter.inlevel9.com/issues/ibm-openai-certified-consultants): 2026-08-20 · Business · 오픈AI가 이들에게 파는 건 모델이 아니라 자격이에요
- [승진을 거절한 코스트코 계산원](https://letter.inlevel9.com/issues/costco-millionaire-cashier): 2026-08-20 · Business · 회사는 그를 40년째 붙잡고 있어요. 그 직원은 이미 백만장자지만요.
- [아이 보는 청년은 '쉬었음'이 아니에요](https://letter.inlevel9.com/issues/youth-caregiving-not-resting): 2026-08-19 · Society · 통계가 이름표를 붙이는 순간, 진단은 이미 끝나 있어요.

## Machine-readable indexes

- [Sitemap index](https://letter.inlevel9.com/sitemap-index.xml): every indexable URL across all three editions
- [Sitemap](https://letter.inlevel9.com/sitemap.xml): with hreflang alternates per issue
- [robots.txt](https://letter.inlevel9.com/robots.txt): crawl policy, including AI crawlers

## About and trust

- [About the publisher and the newsletter](https://letter.inlevel9.com/about): who writes this and on what evidence
- [Contact and business registration](https://letter.inlevel9.com/contact): legal entity, address, email, and phone
- [Press and external coverage](https://letter.inlevel9.com/press): verifiable third-party mentions
- [Privacy policy](https://letter.inlevel9.com/privacy)
- [Terms of service](https://letter.inlevel9.com/terms)