Jae Woong Byun

1. Overview

Jae Woong Byun is a South Korean flyweight mixed martial artist competing under the Korean Zombie MMA banner. Known by the nickname “No Doubt,” Byun has built his career through years of competition in both Korea and Japan, gaining experience against a variety of opponents across multiple promotions.

After spending much of his career competing in Japan’s DEEP promotion, Byun revitalized his career with a successful return to Korea. Consecutive victories under the Z-Fight Night banner have positioned him as one of the more experienced flyweights currently active on the Korean regional scene.

Most recently, Byun earned a unanimous decision victory over Japanese veteran Wataru Yamauchi at ZFN Origin 4, extending his winning streak and continuing his resurgence within the division.

Fighter Record

Official fight records, fight history, and statistical data are maintained by third-party databases and may change as new bouts are added. Readers can view the most up-to-date record information through the sources listed below.

Record Sources

• Tapology Fighter Profile

2. Early Life & Background

Limited public information is currently available regarding Byun’s upbringing and early athletic background.

What is known is that Jae Woong Byun entered professional mixed martial arts at a young age and quickly sought opportunities against experienced competition. Unlike many Korean prospects who remain exclusively on the domestic circuit, Byun spent significant portions of his early career competing in Japan, where he gained valuable experience against seasoned opponents.

This willingness to compete internationally helped shape him into a well-rounded veteran capable of adapting to different styles and competitive environments.

3. Fighting Style

Striking

Jae Woong Byun possesses a fundamentally sound striking game built around timing and patience. While not known as a volume striker, he has demonstrated the ability to control distance and accumulate points over the course of a fight.

His victory over Wataru Yamauchi showcased his composure and ability to execute a disciplined game plan against a dangerous opponent.

Grappling

Grappling remains one of Jae Woong Byun’s strongest weapons. Multiple professional victories by submission, including kneebar and guillotine finishes, demonstrate his ability to capitalize on opportunities when fights hit the mat.

Physical Attributes

At 5-foot-8, Byun possesses above-average height for the flyweight division. His length and experience allow him to remain competitive in both striking and grappling exchanges.

Intangibles

The most valuable aspect of Jae Woong Byun’s game may be his experience. Having competed professionally for nearly a decade across multiple countries and organizations, he has faced a wide variety of styles and situations throughout his career.

4. Professional Career

Early Professional Career

Jae Woong Byun made his professional debut in 2016 and immediately began testing himself against quality opposition. Early victories over experienced Japanese fighters demonstrated his potential as a prospect willing to compete beyond Korea’s borders.

DEEP Experience

A significant portion of Jae Woong Byun’s career was spent competing for DEEP, one of Japan’s most respected MMA organizations. Although results were mixed, the experience provided valuable development opportunities against high-level regional competition.

Return to Korea

Following his time in Japan, Byun returned to the Korean MMA scene and joined Korean Zombie MMA. The move appeared to rejuvenate his career, as he began compiling victories and building momentum once again.

Z-Fight Night Success

Byun’s recent performances at Z-Fight Night have been among the strongest of his career. He secured a first-round kneebar submission victory over Dong Hyuk Ko before earning a unanimous decision win over Wataru Yamauchi at ZFN Origin 4. These victories have elevated his profile within Korea’s flyweight division.

5. Career Highlights

Notable Victories

• Wataru Yamauchi (Unanimous Decision, ZFN Origin 4)
• Dong Hyuk Ko (Kneebar Submission)
• Jeremy Santiago (Unanimous Decision)
• Kazuki Shibuya (Guillotine Choke Submission)

Accomplishments

• Nearly a decade of professional MMA experience
• Competed extensively in both Korea and Japan
• Multiple victories by submission and decision
• Active member of Korean Zombie MMA
• Current multi-fight winning streak

6. HanPunch Rating

Overall Grade: B+

HanPunch Assessment

Jae Woong Byun represents the type of experienced regional veteran who can challenge younger prospects while remaining competitive against established names. His extensive experience in Japan and Korea has created a well-rounded skill set that makes him a difficult matchup for most regional flyweights.

While he may not possess the hype of an undefeated prospect, his recent performances suggest he remains a relevant figure within the Korean flyweight landscape.

7. Summary & Trajectory

After experiencing both highs and lows throughout his professional career, Byun appears to be enjoying one of the strongest stretches of his time as a professional fighter.

His victories over Dong Hyuk Ko and Wataru Yamauchi have demonstrated continued growth and maturity inside the cage. If he remains active and continues defeating quality opponents, Byun could position himself for opportunities against some of the top flyweights competing in Korea and Asia.

At this stage, he should be viewed as an experienced contender capable of testing any prospect looking to climb the Korean flyweight rankings.

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