Minsoo Lee (이민수) started in games in 2002 with QA on the overseas edition of the PC RPG Arcturus, which led him to design work on Ragnarok Online — and he has been making games for 24 years since. He has moved between new development and live operations of MMORPGs, from R2 Online and Bless to MIR4 live ops, and has shipped a mobile roguelike along the way. He currently serves as design director on an MMORPG project.

He has always been a "designer who builds tools." He wrote damage simulators in VBA and made them the baseline for balancing; on large-scale projects he took on PM duties and derived update plans from production-throughput simulations. Before ChatGPT even existed, he wired the GPT-3 API into Google Sheets and ran a pipeline that auto-generated monster lore and quest drafts in production. To him, generative AI is not a trend but an old work tool.

Over the past six months he brought Claude Code into production and built his team's operating system around 304 rules and 48 tools — and that operating record became his book, AI Workflow for Game Designers.

At home, he builds small games alone. The same system running at both work and play — that, too, is what his book wants to say.