Zhou Qingrong is a professional lawyer. He is known as Yan Yan. He likes to laugh. His smile is as gentle as jade, which makes people relax their vigilance. He is full of tricks and will do anything to achieve his goals.
Gu Bai is a young policeman from the police station. He likes to play, loves freedom, has a playful smile, and appears to be a bohemian kid from a rich family. In fact, he is a must-have warm boy at home.
The two met in a busy bar, had a one-night stand, and got acquainted in one case after another. The two gradually got to know each other deeply, uncovering the secret hidden in Zhou Qingrong's soft smile, and told the story of the two people falling in love and killing each other.