He is a member of his father's set of the Triads, the Jaoming Family. Chan is one of three possible contenders (the other two being Wu Lee and Zhou Ming) to inherit his father's position. He is believed to be the underboss of the Jaoming Family and has a group of loyal supporters. Both him and Zhou were falsely accused of being the FIB informant who was ratting out the Triads (only for it to be revealed to be Kenny) and they were both killed by Huang Lee on Hsin's orders.
Chan has been arrested on three occasions: once in 1999 for possession of heroin, again in 2003 for extortion and 2005 for possession of stolen property. Chan is described as a playboy (he mentions having sex with twins and a transsexual prostitute), drug-addled, and too stupid to become his father`s successor as the leader of the Jaoming Family. Chan is also oblivious to Huang's constant mocking and sarcastic remarks.
Melanie Mallard (Killed for attempting to broadcast Chan's operations on TV without blurring Huang's or Chan's faces) (PSP only)
Chinese last names usually consist of only one character; and "Jaoming" is not a real surname. There was never such a surname in Chinese (But in the olden ages, like the timeline of The Romance of the Three Kingdoms, last names with two characters actually existed. Examples include Au-Yeung [歐陽], Zhuge [诸葛] and Sima [司馬]. These surnames still exist nowadays, but are relatively rare.).
The name "Chan Jaoming" is probably a reference to Yao Ming, a famous Chinese basketball player. Also the origin of the even more famous "Yau Ming Meme".