BOOK
Korean edition of #100 Days Challenge, #100일챌린지, published by Insight
The Korean edition of #100 Days Challenge, the book by author and app developer Ami Otsuka (representative of Hundreds LLC), was published on July 21, 2025 by the Korean publisher 인사이트 (Insight) under the title #100일챌린지.
320 pages, 18,000 won, ISBN 9788966264810. The translator is 류두진 (Ryu Du-jin).
The cover line reads "AI 시대, 가장 강력한 스펙은 하루 한 도전을 100일간 이어가는 힘이다": in the age of AI, the strongest qualification is the ability to keep one challenge a day going for 100 days.
Links교보문고（教保文庫）
About Ami Otsuka
Author and app developer; representative of Hundreds LLC. Starting in October 2023, while a student at Chuo University, she built an app a day with ChatGPT for 100 consecutive days and posted each one to X, a record published as #100 Days Challenge: I Built 100 Apps in 100 Days and My Life Changed (Nikkei BP, 2025). Named to Forbes JAPAN's Women In Tech 30 in 2026. She is now based in Thailand, writing, speaking and building apps.
