Ruthless land developer Liu Xuan is planning reclamation project for Green Gulf. He's using powerful sonar to drive away dolphins. He takes on Ruolan as his business partner. The playboy Liu Xuan calls up cheap floozy Shan after being ridiculed by Ruolan. Only they don't know that Shan is actually a mermaid. She is part of a community being driven out by Xuan's sonar. Shan is told by Brother Octopus to assassinate Xuan. After many failed attempts, Shan wins over Xuan with rotisserie chicken. Shan is conflicted about killing him but a conflict is inevitable.
This is Stephen Chow's very broad brand of comedy. The museum mermaid is hilarious. There are some funny bits with Shan. There are lots of funny with a good helping of environmentalism. However, there are some uncomfortable violence especially the climatic battle. Chow is obviously heavily influenced by documentaries such as The Cove. It's awkward to have such vicious violence trying to coexist with the broad cartoon comedy. There is a difference between cartoon violence and brutal horror violence. He needs to cut down on the horrifying.