Kin =]
HKer, InfoSec enthusiast currently into Computer Forensics, Wireless Attack, Web Security, GNU/Linux, and Open source. Also hunting CVEs :D
Aspiring to become a professional Red Team operator. INTP-T (MBTI)
CTF Team
ICEDTEA
CTF Team ICEDTEA A Taiwan based CTF team that I am part of 
HeapUnderFlow
CTF Team HeapUnderFlow My current Hong Kong based CTF team
Challenge Creator
NHNC CTF
Challenge Creator NHNC CTF I created challenges and helped with the design side for No Hack No CTF. 
THJCC CTF
Challenge Creator THJCC CTF A Taiwai CTF event where I also contributed challenge-related work.
Hacking
TryHackMe
Practice Platform TryHackMe Used for rooms, labs, and certification tracks. HackTheBox
Practice Platform HackTheBox Used for labs, boxes, and web exploitation practice. 
CryptoHack
Practice Platform CryptoHack A platform I use for learning and practicing cryptography.
Creator
UmmItOS
My Project UmmItOS My own Arch-based distribution and personal Linux experiment.
Community
HKPUG
Community Hong Kong Python User Group I join HKPUG activities and occasionally give talks there.
Candidate
OSCP
Offensive Security OSCP Offensive Security Certified Professional - Advanced penetration testing certification. 
CWES
HackTheBox CWES Certified Web Exploitation Specialist - Advanced web application security certification. 
CJCA
HackTheBox CJCA Certified Junior Cybersecurity Associate - Entry-level cybersecurity fundamentals. 
PT1
TryHackMe PT1 Junior Penetration Tester - Foundational penetration testing skills certification.
I’ve been self-taught since I was a kid, and I’m currently studying InfoSec in Hong Kong. My interests span red teaming, reverse engineering, web development, web hacking, and app development — mostly software hacking stuff. I started taking things seriously around middle school, beginning with HTML, CSS, and JavaScript, then moving through C#, VB.NET, and a few others. Most of those are behind me now; these days I focus on web hacking and red team work.
I'm a huge GNU/Linux enthusiast. I've tried at least 20 different distros and experiments over the years. My main system is Arch Linux — seven years and counting. Yes, I'm still a student with over seven years of experience; I started back in secondary school. Right now I'm using my own Arch-based distribution called UmmItOS, named after my internet nickname. XD
I used to be a Windows user, but I'm now 100% on GNU/Linux. I only touch Windows when I'm attacking Active Directory. Lots of stories from the journey ... this is just a small part :D
GPG Key
Sponsor
Support my work — coffee fuels more CTF writeups, OSS, and zero-day hunting.
Contributions
3,896 contributions in the last year
Skills
This is my skill :D
Timeline
No Hack No CTF
Challenge Creator & Web Designer
gitgit & Crackme challenges creator, website designer.
Hong Kong Python User Group (HKPUG)
Member and Occasional talker :)
Join the Hong Kong Python community and occasionally give talks there.
Zero-Day Hunting
Randomly hunting zero-day vulnerabilities
I do it for fun and learning purposes, no public disclosures yet.
Competition Experience
Only the best runs are listed — I play other CTFs casually too, just not at full effort.
DEF CON CTF Qualifiers 2026
PolyU CTF 2026
HITCON CTF 2025
HKCERT CTF 2025
| Competition | Date | Team | Division | Placement | Pts / Solves |
|---|---|---|---|---|---|
| DEF CON CTF Qualifiers 2026 | May 22–24, 2026 | IB2XD | — | 26/686 | 4,852 |
| PolyU CTF 2026 | Mar 6–8, 2026 | 
HeapUnderFlow
| Sub-degree | 3/20 |
11,427 / 36
Global: 20/179 |
| HITCON CTF 2025 | Aug 22–24, 2025 | 
ICEDTEA
| — | 29/717 | Taiwan Top 4 |
| HKCERT CTF 2025 | Dec 19–21, 2025 |
HeapUnderFlow
| Open | 29/597 | — |