Chung Ka Bo, a policewoman with IQ 189 and expert in Martial Art, she is a superstar of the Hong Kong Police Force. Bo desires to get married with her boyfriend, Peter Poon, they have been together for 7 years but break up eventually because Peter falls in love with a young model.

Formed by 4 young girls, “Yogurt” is a new model group. Members of “Yogurt” received a death threatened mysteriously and their assistant even suffered serious injury by attack. Bo was sent to investigate that case as an undercover, in fact she wants to find out who is the new girlfriend of Peter. Unexpectedly, Bo was pursued by Shing Dai Chi, son of the boss of the model management

company and Bo finds she was attracted by Dai Chi.

But the worst thing happened, members of “Yogurt” were attacked one by one. Everyone can be the victim and murderer at the same time. On the other hand, Dai Chi proposed to Bo, who is facing the dilemma of confessing her undercover identity to Dai Chi. At the same time, the

murderer shows up again…