The policeman room officer Liu Meili (Jaycee Chan decoration ) is a handsome handsome boy, between the forehead always has a kind of indescribable melancholy, and there is a called "beauty ". He grew up in the charm of the mother and three beautiful sisters grew up under the care of the. In order to prove himself, despite family opposition candidates new pts. Graduated from the police station still hiding but circulated the female line protection of the family: brother Liang Sheriff (Luo Dahua decoration) distribution of beauty to patrolling the streets, can not think of US force unexpectedly into the gang when undercover. In the fierce famous underworld boss brilliant brother (Chen Baoyuan decoration ), found himself in a bit of sexual orientation and dislocation, secretly appealing psychological doctor, also found just joined forces is actually an undercover police. For the beauty of the beloved force, and would like to take the washed his brother, shining with " undercover ".