A snake-like monster appeared, and in an instant, its tongue wrapped around the old fisherman and dragged him away; a moment later, an 18-year-old girl, Xin Rui, came out. She was covered in mucus and scales appeared on her face from time to time. High school student Fu Junhao found the girl Xin Rui and took her home. After that, people disappeared on the island one after another. While searching for the missing friends, Xin Rui and Fu Junhao discovered a mysterious base under the island, and a snake-like monster appeared in the underground base. What is the identity of the girl Xin Rui? What kind of connection does she have with the monster? What is the truth? The kind-hearted Fu Junhao would never have thought that he would be involved in a huge disaster...