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Yeonwoo Park previously conducted penetration testing projects targeting Korean companies at his former workplace (Core Research Team at Raon Secure) and currently serves as a red teamer at his current workplace (Cyber Threat Analysis Team at SK AX).Through his AD zero-day research, he discovered an exception-handling flaw in the Kerberos protocol, uncovering a method to bypass Microsoft's security policies. Furthermore, through continuous research into areas undetected by popular open-source tools like BloodHound and unexplored topics, he contributes to enhancing the maturity of the red team.

Hushcon West 2019Presented a technical talk on cellular infrastructure security, focusing on real-world weaknesses in mobile and carrier-adjacent systems. The session drew from hands-on research into cellular protocols, deployment realities, and how attackers exploit assumptions in telecom environments that are often treated as “trusted” or out of scope by enterprise security teams.Hushcon East 2023Delivered a talk centered on hacker culture, attacker mindset, and how security thinking evolves outside formal frameworks. The session explored how curiosity-driven exploration, informal knowledge sharing, and cultural norms shape real attacker behavior more accurately than checklists, tooling, or compliance-driven models.PRaSEC 2023Presented a red-team-focused session on Domain Admin attack paths, blending practical exploitation techniques with philosophical perspectives on adversary reasoning. The talk emphasized how attackers model trust, authority, and system design to move from initial access to full domain control.

Red Team operator at Siemens. Holds various hacking certifications such as: OSCP, OSWP, CRTP, eMAPT, etc. Interested in many fields within hacking: red teaming, cloud, web security, AI, low level stuff (reversing, pwn, etc). Speaker in various conferences: hack0n, RootedCON Málaga, Honeycon, Worldparty, DragonJARCon, etc.

Mars Cheng leads TXOne Networks' PSIRT and Threat Research Team as their Threat Research Manager, where he coordinates product security initiatives and threat research efforts. He also holds the position of Executive Director for the Association of Hackers in Taiwan, facilitating collaboration between enterprises and the government to bolster the cybersecurity landscape. Additionally, Mars serves as a Cybersecurity Auditor for the Taiwan Government. His expertise spans ICS/SCADA systems, malware analysis, threat intelligence, and hunting, as well as enterprise system security. Mars has made significant contributions to the cybersecurity community, including authoring more than ten CVE-IDs and publishing in three SCI journals on applied cryptography.Mars is a frequent speaker and trainer at numerous prestigious international cybersecurity conferences, including Black Hat USA/Europe/MEA, RSA Conference, DEF CON, CODE BLUE, SecTor, Troopers, FIRST, HITB, ICS Cyber Security Conference Asia and USA, HITCON, NoHat, ROOTCON, SINCON, CYBERSEC, and many others. He plays an instrumental role as the General Coordinator for the HITCON CISO Summit 2024 and has successfully organized several past HITCON events including HITCON CISO Summit 2023, HITCON PEACE 2022, HITCON 2021, and HITCON 2020, demonstrating his commitment to advancing the field of cybersecurity.