Unbeatable

After a stint in prison for participating in underground boxing, Fai is knee-deep in debt with no solution in sight. To escape his debtors, he flees to Macau and works as a gym assistant. He meets and ends up training Si-Qi, a hot-blooded young man who enrolled in an open MMA competition with no fighting experience. After a series of wins, Si-Qi is critically injured and eliminated from the tournament. Ignited by Si-Qi's persistence and unwillingness to give up in the face of defeat, he rediscovers his will to fight and steps back in the ring against the fighter who injured his student…