The film tells the bizarre story of two folk heroes fighting for justice and slaying demons during the Republic of China.

After his fiancé sudden death, Qin Yu is convinced Cass Corporation is somehow involved and is determined to find the truth. Booking passage on the same cruise ship as former Cass employee, Jason, Qin Yu follows him. Qin Yu hopes to secure the information he needs on Cass to be able to testify against them in court. But Qin Yu isn’t the only person on board hoping to gain intel on Cass. Desperate for a story, reporter Feng Li tails both Qin Yu and Jason, booking passage on the same cruise. Unfortunately, no one has much of a chance to gain information as the ship is suddenly attacked by giant mutant snakes. Escaping the attack, the survivors find themselves on the very island Cass Corporation has been conducting their illegal experiments. Hunted by monsters of all sorts, will any of the survivors find a way to bring Cass down and make it off the island alive?

A demon spirit who has been cultivating virtue all his life, and has accumulated merit and virtue, but unexpectedly, the demon of evil thoughts, Chang Sheng, who considers himself to be an immortal, tries to control the entire demon world and causes misfortune.