About Me
Hi, how did you find me?
I’m a second-year student studying at Korea University. My current interest is in VR Automation & Browser Engine. I’m also in an academic CTF team, participating as a web player. You can view my profiles here: Dreamhack and WeChall.
Besides coding, my hobbies include rhythm games, digital art, experimenting with LLMs, math, reading, checking out recent papers, and listening to breakcore. I’m multilingual, speaking Korean natively and English fluently, with conversational abilities in Japanese and Mandarin(trust me, I read code better).
My previous majors, psychology and neuroscience, remain my favorite reading topics.
This blog serves as both a personal diary and a source of information. While some posts aim to educate, others track my learning journey. Content is primarily in English, though some posts are in Korean.
Odyssey with computers
| Date | Achievement |
|---|---|
| 2020.3 | Made my first static website with custom CSS/HTML/JS. |
| 2020.7 | Began learning my first language (C) with a focus on problem-solving (PS). |
| 2020.12 | Solved 150 challenges on solved.ac. |
| 2021.6 | Learned my second and third languages (Python, JS). |
| 2021.7 | Made a game with Pygame and got first place at my university contest(KUCC 해커톤). |
| 2021.8 | Made my first-ever Discord bot. |
| 2022.6 | Continued to play around with stuff, made several Discord bots and simple games. Also, did PS and learned Java, SQL, PHP, etc. |
| 2022.7 | Interned at KU Wisdom Science Center (심리학부 지혜과학연구센터). |
| Made a website that automatically preprocesses data with PHP and JS, uses the jsPsych library. | |
| TA’d several programming lectures targeting psychology majors. | |
| 2022.8 | Began solving CTF challenges, got into cybersecurity and hacking with web. |
| Attended POC security HACKINGCAMP, got 6 solves in my first-ever CTF. | |
| 2022.9 | Reported a URL scheme SSRF vulnerability in APOLLO CTF playground. |
| 2022.11 | Made a small CTF team called Cat2Flag (captain, was mostly a web player). |
| 2022.12 | Solved about 200 CTF/wargame challenges (2022.9~), playing about 4 beginner-friendly CTFs per month. |
| 2023.3 | Assisted in writing an academic paper on SQL injection, did a lot of stuff experimenting with SQL and Docker. |
| 2023.4 | Ran a small RPG Discord server with a custom Discord bot. |
| 2023.7 | Got into KITRI BoB vulnerability analysis track. |
| 2023.8 | Began studying pwn & Linux kernel. |
| 2023.9 | Did a project with my teammates on hacking the Linux kernel (Detecting data-races leading to memory corruption with custom fuzzing framework). |
| 2023.11 | Found 14 vulnerabilities (exploitable vulnerabilities included). Also did speaker for CISC-W’23 한국정보보호학회 동계학술대회 (academic conference from KOREA INSTITUTE OF INFORMATION SECURITY). |
| 2023.12 | Solved about 600 CTF/wargame challenges. |
| 2024.1 | Got out of my comfort zone with web and began solving level 7-8 challenges on Dreamhack, now recording rank #74. |
| 2024.3 | Transferred from Psychology major to Cybersecurity (고려대학교 심리학부 -> 스마트보안학부) |
| 2024.3 | Intern at COMPUTER SYSTEMS SECURITY LAB in Korea University |
| 2024.3 | Joined CyKor as web player |
| 2024.3 | Completed KITRI BoB 12th vulnerability analysis track |
| 2024.6 | Did a paper on Windows Drivers, accepted by CISC-S’24 한국정보보호학회 동계학술대회 (academic conference from KOREA INSTITUTE OF INFORMATION SECURITY). |
| 2024.8 | Did a talk at Hacker’s Night with FindTheGap & Samsung SDS |
| 2024.9 | Reported my first v8 bug to chromium |
You can always contact me via discord @qwertek, or with email qwertek7@gmail.com.
My old blog is here.