Biology students from Haibin University of Science and Technology came to a small town at the foot of Changbai Mountain in search of a rare plant. It is covered with snow all year round and is deserted. Many people say that a thousand-year-old snake spirit lives here. But no one has seen it. Liu Yang and his classmates lived in a mountain hut, and strange things happened one after another. Some people even said they saw a white snake. Is this true?