Injured Black Cup competitor Sung Jun Park (“Underdog”) opens up about missing the Korea vs. Mongolia event, Big Mouth’s short-notice replacement, and Omega Team’s emotional journey.
When Sung Jun Park (“Underdog”) arrived at Black Cup on July 25, he wasn’t carrying gloves—he was carrying regret.
Originally scheduled to represent Omega Team in the Korea vs. Mongolia tournament, Park was forced to withdraw after suffering an arm injury shortly before the event. The injury paved the way for teammate Big Mouth to step in as a late replacement, while Park watched the competition from the sidelines.
For the first time since the tournament began, he experienced Black Cup not as a fighter, but as a teammate.
More Than an Individual Tournament
Looking back on the experience, Park admitted Black Cup didn’t always feel like a team competition.
When filming first began, he said everyone approached the project with an individual mindset.
“At first it felt like an individual competition. I thought, ‘As long as I win, that’s enough.'”
That changed over time.
Training together, filming together, and enduring months of preparation transformed Omega Team into something much closer to a genuine fight team.
Although he could no longer compete, Park still traveled to support his teammates, believing they would reach the final and hoping he would have another opportunity to fight after recovering.
Months of Preparation Gone Overnight
Park said the injury was especially difficult because he believed he was entering the event in the best condition of his career.
Balancing fatherhood with training, he described squeezing workouts into every available moment and dedicating himself completely to the tournament.
Rather than dwelling on the injury itself, his greatest disappointment was never having the chance to showcase the work he had put in.
He also expressed gratitude for the overwhelming support from fans after announcing his withdrawal, saying the encouragement he received exceeded the reaction to many of his previous victories.
Respect for Mongolia
Watching from cageside gave Park a different perspective on the event.
Instead of blaming Omega Team’s performance, he credited the Mongolian fighters for earning their victories.
Throughout the video, he repeatedly praised their toughness, physical strength, and unconventional style.
One observation stood out in particular.
According to Park, many of the Mongolian fighters attacked with unusual timing, especially with their lead hooks. Rather than throwing textbook combinations, they relied on awkward rhythms and physical confidence that disrupted the reactions of technically polished opponents.
He believes that unpredictability played a major role throughout the event and serves as another reminder that there is no single blueprint for success in mixed martial arts.
Big Mouth Steps In
The most emotional part of Park’s reflection centered on Big Mouth, who accepted the fight after Park’s withdrawal.
Rather than second-guessing the outcome, Park emphasized the difficult circumstances.
Big Mouth had little time to study the opponent or prepare specifically for the matchup, making the assignment one of the toughest on the card.
Backstage after the fight, Park recalled Big Mouth apologizing for not winning.
Instead of making excuses, the late replacement was frustrated with his own performance, a reaction Park said showed the mentality of a true fighter.
Importantly, Park avoided claiming he would have produced a different result.
Instead, he explained that his frustration came from losing the opportunity to implement the game plan he had spent weeks developing.
The Team Comes First
Despite Omega Team’s elimination, Park’s biggest takeaway wasn’t about wins or losses.
It was about the bond that developed throughout Black Cup.
He thanked his teammates, expressed his appreciation for Big Mouth’s willingness to step in, and asked fans to support every Omega Team member moving forward.
He also urged supporters to distinguish between criticism and personal attacks.
“Criticism is part of the sport,” he explained, “but unnecessary abuse isn’t.”
As for his own future, Park said he continues to rehabilitate his injured arm and does not yet know when he will return to competition.
What It Means
Sung Jun Park’s video isn’t really about missing one fight.
It’s about the emotional side of MMA that fans rarely see.
Fight camps consume months of preparation, sacrifice, and planning, yet a single injury can erase everything just days before competition. Rather than focusing on what might have happened, Park chose to celebrate his teammates, acknowledge Mongolia’s performance, and support the fighter who stepped into his place.
For Omega Team, Black Cup may be over.
For “Underdog,” however, the story feels unfinished.
His comments suggest that while he has accepted what happened in July, he is already looking toward the day he can finally return and show the work that never made it into the cage.
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