Offensive Security Engineer, Developer and H4cker.

Hello! I'm Lee Hwan, better known online as HAHWUL. An Offensive Security Engineer and hacker based in South Korea.

Rust and Crystal: My Two Main Languages

Balancing Popularity and Quiet Power

Writing

All posts

APR 19, 2026 Traveling with Hermes in Japan My Remote Setup and Project Workflow While Traveling
MAR 22, 2026 Building AI-Friendly CLIs JSON-First Design with Schema Commands
FEB 22, 2026 10 Years of Reflection and a New Beginning 10 years of hahwul.com. Looking back and sharing what’s next.

Notes

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Claude Code Remove co-authored-by when committing

Projects

All projects

Dalfox XSS scanner and utility focused on automation

OWASP Noir Attack surface detector via static analysis

Hwaro Lightweight static site generator