Playboy business tycoon Liu Xuan (刘轩, played by Deng Chao) 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 mermaid and the sonar (in addition to heavy pollution) has caused many of them to die or get sick. The few survivors live in an abandoned shipwreck in the gulf, and want to assassinate Xuan for his deeds. The merfolk send Shan (珊, played by Lin Yun), a beautiful young mermaid, who has been trained to walk and dance on her fins and hide among humans, to seduce and kill Xuan. At an extravagant party celebrating Xuan's success, Shan, pretending to be a dancer, gives him her telephone number and asks him to call her.