About

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

I really enjoy programming in languages like Crystal, Rust, Go, and Ruby. 'hahwul' is a word I created from my name, and it basically represents me. You can call me Hahwul or Hawul — whichever you prefer!

Security Engineer, Hacker

Online, I'm usually known as a bug bounty hunter and open-source developer. Offline, I work as an Offensive Security Engineer at a company, focusing on Red Team, AppSec, and DevSecOps roles. And at night, I become a bit more of a free-spirited hacker.

Either way, finding vulnerabilities and breaking into systems still brings me huge joy — from when I was a junior just starting out to now, well over 10 years later :)

Developer

My programming journey started in high school with C and C++. After trying Ruby, Go, and many others, I'm currently focusing on Crystal and Rust.

I’m active as an open-source developer, creating various security testing tools, and I enjoy contributing to other security projects as well. If you’re curious about my work, check out the Projects page or my GitHub.

Gear and Tools

I’m also really into computer gear — keyboards, mice, and all that stuff. If you want to see my desk setup, head over to the "Tool. Apps. Gear!" page.

HHKB - This keyboard is my life. There's no going back to another one.

Site

This site is built with hwaro, a Static Site Generator (SSG) I created myself.