Hong Kong is hailed as the safest city in Asia. Recently, Hong Kong has witnessed some street racing people who deliberately cause trouble to the citizens. The police always adopt a zero-tolerance attitude towards illegal street racing drivers, aka street racers. Hence, the Hong Kong police specially select elites from the Traffic Branch and constitute an Anti-Racing Team to conduct special regulations on the street racers. The Anti Racing Team, with Cheng Zhi Fei as the leader, starts to work on the investigation. An illegitimate street racing organization led by Jiang Xiao Hai surfaces, which intends to secretly hold an illegitimate street racing game in Hong Kong so as to acquire illegal profits. During the investigation, Cheng Zhi Fei and Jiang Xiao Hai's grudge harbored for 15 years also reveals itself...

Kung and Kin's rivalry goes way back to the seventies when they fought over the same girl, who eventually became Kung's wife. Now they run competing phone stores right across from each other on Mongkok's busiest street, and stretch their minds trying to outdo each other with crazy promotions.