A classmate who was on an outing had a car accident and all the bodies were missing. The old man who had just been buried was also missing.
In order to solve the mystery, Jin Su came to Fuxian Lake and met Hu Er, the inverted fighter. Hu Er said that a monster appeared in the lake recently, specializing in sucking the corpse air of dead bodies. Many people have been scared away.
Jin Su dives and discovers that a castle appears at the bottom of the lake, hidden in a deep crack in the ground. The missing bodies were all turned into skeletons at the gate of the castle. Who has eaten up their flesh and blood? Who built the castle? What are the mysteries inside? Before Jin Su could figure it out, danger came.