Se Hoon Choi, known as “Yangsan Mad Man,” is an undefeated South Korean light heavyweight competing for MK Gym.

Since making his professional debut in 2024, Se Hoon Choi has remained unbeaten while competing exclusively in Z-Fight Night (ZFN). Through his first four professional bouts, he has earned three first-round stoppage victories while also demonstrating the ability to win over three rounds. His undefeated start has established him as one of South Korea’s emerging light heavyweight prospects.

Publicly available information regarding Choi’s early life, amateur career, and martial arts background is limited. Verified public sources identify him as a South Korean athlete who made his professional MMA debut in 2024. No verified interviews or official biographies have been published that provide additional details regarding his upbringing or martial arts journey.

Striking

Se Hoon Choi’s professional record demonstrates proven finishing ability. Three of his first four professional victories have come by first-round TKO, including wins over Jae Geun Yang, Bum Seok Jang, and Jae Woong Yoon. Based on currently available public information, striking has been his primary path to victory.

Grappling

Se Hoon Choi’s lone decision victory came against Jun Gu Kim, showing he is capable of competing through a full three-round contest. However, because he has not recorded a professional submission victory and limited fight footage is publicly available, there is insufficient verified information to accurately assess his wrestling or submission game.

Fight IQ

Although still early in his career, Se Hoon Choi has shown the ability to finish quickly while also remaining composed in a competitive decision victory. With only four professional bouts, additional competition will provide a clearer understanding of his tactical approach and overall cage management.

Se Hoon Choi made his professional debut at ZFN 2 on December 14, 2024, defeating Jae Geun Yang via first-round TKO. He followed with a majority decision victory over Jun Gu Kim at ZFN Origin in April 2025, earning his first victory on the judges’ scorecards.

Later that year, Choi returned at ZFN 3, stopping Bum Seok Jang by first-round TKO in the co-main event. He continued his unbeaten run at ZFN 4 on May 9, 2026, defeating veteran Jae Woong Yoon via first-round TKO in 1:39. The victory improved his professional record to 4-0, with three of those wins coming inside the opening round.

Still in the early stages of his professional career, Choi remains one of the more intriguing young light heavyweights competing on the Korean regional circuit.

• Undefeated professional record
• Represents MK Gym
• Competitor in Z-Fight Night (ZFN)
• First-round TKO victory over Jae Geun Yang
• Majority decision victory over Jun Gu Kim
• First-round TKO victory over Bum Seok Jang
• First-round TKO victory over Jae Woong Yoon

With four consecutive victories to begin his professional career, Se Hoon Choi has quickly established himself as a prospect worth following in Korean MMA’s light heavyweight division. His early résumé reflects both finishing ability and composure under different fight circumstances.

As his level of competition increases, Choi has an opportunity to continue climbing the domestic rankings and establish himself among South Korea’s top light heavyweights.