A retired contract killer goes on a bloody rampage when a young girl finds herself at the mercy of gangland human traffickers and only one man can come to her rescue, with an arsenal of weapons and years of experience in the art of killing.

Fai, once a world champion in boxing, escapes to Macau from the loan sharks and unexpectedly encounters Qi, a young chap who is determined to win a boxing match. Fai becomes Qi's mentor and rediscovers his passion to fight not only in the ring but for his life and the cares.