CJ Liu

Day1CJ is the public entrepreneurial challenge and personal brand of CJ, a Chinese AI founder documenting a fresh start in London. After founding Beijing-based OneXOne Tech in 2020 and building HiBug and ShiZhe AI, CJ’s AI product was acquired by Xueda Education in June 2026. The site describes backing from Baidu, MiraclePlus (YC China), and Fenghe Capital.

Its central project followed CJ’s attempt to grow £100 into £1 million in 100 days, using one AI tool, Claude and Claude Code, while recording income and expenses transparently. The challenge has ended, with the website reporting £37,685. 99 in revenue and £4,942.

56 in expenses. Day1CJ offers a live financial dashboard, challenge updates, public notes, and recap materials, alongside content shared through social platforms including TikTok, YouTube, Instagram, and LinkedIn. The project aims to show the realities of building an AI business, including setbacks and practical lessons, so viewers can follow, learn, and potentially apply what they observe