He keeps his identity secret from the public (and avoids photographs so he will not be recognised), but is known for three characteristics: his slicked-back hairstyle, his love of Feodora-brand chocolate, and his jade pinky ring.

In gratitude, Ueyama sends his bodyguard, former Army of the Republic of Vietnam Special Forces Operative, Dragon, to accompany Ko Chun for protection.

Knife, not knowing who the unnamed stranger is, takes him in and names him "Chocolate" due to the man's seemingly obsessive love for the candy.

A fierce shootout ensues in a shopping centre, in which Knife saves Chun from an attempt on his life by Ko Yee.

During the fight, Dragon is wounded, causing Chun to snap out of his child persona briefly to kill the rest of the assailants.

Later, Ko Yee gives Chan Kam-sing special eyeglasses that will allow him to cheat during his upcoming poker match with Chun by reading invisible markings on the cards.

Chun, Yee, Ueyama and Dragon arrive on Chan Kam-sing's yacht for the climactic game of five-card stud.

Ko Chun, in turn, reveals that he actually has the superior hand and has won the game, having secretly altered the markings of the deck and using special contact lenses to read them.

Ko Chun then departs (as police arrive to take Chan into custody for murder) without speaking to Knife, much to the latter's dismay.