A gifted criminal profiler, Fang Mu was asked to assist the police in solving a bizarre campus serial killing. Working together with Police Captain Tai Wei, Fang Mu tries to crack down the murder cases, but he unknowingly gets embroiled in a battle of wits.
A playboy business tycoon, Liu Xuan, purchases the Green Gulf, a wildlife reserve, for a sea reclamation project, and uses sonar technology to get rid of the sea life in the area. Unknown to him, the Green Gulf is the home of merpeople, and the sonar has caused many of them to succumb to illness or die. Xuan's business ventures in the area are threatened when he crosses paths with the mermaid, Shan, who is sent to avenge her people.
Meng Na goes to Qiang village to teach but there she falls in love with the Qiang culture and people.