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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.

CTF Team ImageICEDTEA CTF Team ICEDTEA A Taiwan based CTF team that I am part of ImageHeapUnderFlow CTF Team HeapUnderFlow My current Hong Kong based CTF team
Challenge Creator ImageNHNC CTF Challenge Creator NHNC CTF I created challenges and helped with the design side for No Hack No CTF. ImageTHJCC 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. ImageCryptoHack Practice Platform CryptoHack A platform I use for learning and practicing cryptography.
Creator ImageUmmItOS My Project UmmItOS My own Arch-based distribution and personal Linux experiment.
Community Image HKPUG Community Hong Kong Python User Group I join HKPUG activities and occasionally give talks there.
Candidate ImageOSCP Offensive Security OSCP Offensive Security Certified Professional - Advanced penetration testing certification. ImageCWES HackTheBox CWES Certified Web Exploitation Specialist - Advanced web application security certification. ImageCJCA HackTheBox CJCA Certified Junior Cybersecurity Associate - Entry-level cybersecurity fundamentals. ImagePT1 TryHackMe PT1 Junior Penetration Tester - Foundational penetration testing skills certification.

I’ve been self-taught computer stuff since I was a kid, and I’m currently studying InfoSec in Hong Kong. My interests are wide-ranging — red teaming, reverse engineering, web development, web hacking, and app development. As you see, mostly are related to software hacking stuff. I started seriously learning around middle school, beginning with HTML, CSS, and JavaScript, then moving on to C#, VB.NET, and more. Those are mostly behind me now. I’m focused on web hacking and redteam work now.

Also, I'm a huge GNU/Linux enthusiast. I've used at least 20 different GNU/Linux distros and experiments. I currently use Arch Linux as my main system and have been using it for seven years. Yes, I'm still a student, but I already have over seven years of experience. I actually 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 and only touch Windows when I’m attacking Active Directory. There are lots of stories from my journey ... this is just a small part :D

When I’m not coding or hacking, I’m usually watching anime. Pretty boring ... Yes. I know what you think :(


GitHub Twitter Youtube


Contributions

1,500 contributions in the last year

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Skills

This is my skill :D


Timeline

ICEDTEA CTF

2023 - Present

Team member

HeapUnderFlow CTF

2025 - Present

Core member

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.

TryHackMe

Active Player

Ranked in the top 4% of TryHackMe players

Zero-Day Hunting

Randomly hunting zero-day vulnerabilities

I do it for fun and learning purposes, no public disclosures yet.


Competition Experience

PolyU CTF 2026

Jeopardy-style CTF · 06 Mar 2026, 8:00 PM HKT - 08 Mar 2026, 8:00 PM HKT

Sub-degree Group · with HeapUnderFlow

Placed 3/20 with 11,427 points and 36 solves.

Global: 20/179.

HITCON CTF 2025

Jeopardy-style CTF · 22 Aug 2025, 14:00 UTC - 24 Aug 2025, 14:00 UTC

with ICEDTEA

Placed 29/717 and Taiwan Top 4.

HKCERT CTF 2025

Jeopardy-style CTF · 19 Dec 2025, 4:00 PM HKT - 21 Dec 2025, 4:00 PM HKT

Open Division · with HeapUnderFlow

Placed 29/597.


Stacks

The Stacks for my development, hacking, and daily use. Cannot list all here, just the main ones :)