Lin Bei, a wealthy CEO, is murdered by his wife, Xu Weiwei, and her lover, Zhou Teng, who leave him to drown in a lake. Unexpectedly, he awakens a shocking evolution system and is reborn as a fish. By frightening anglers of all kinds, he accumulates evolution points and gradually evolves from a little fish into a mighty dragon. He also discovers treasures at the bottom of the lake, which he uses to help his impoverished parents. While constantly playing tricks on expert anglers, he gathers evidence of Xu Weiwei and Zhou Teng's plot to seize his family fortune and their deliberate attempt to murder him. In the end, he transforms into a dragon and exposes their entire conspiracy in front of everyone. The villains suffer the consequences of their own evil deeds, and Lin Bei finally protects his family and begins a brand-new life.