Female head catcher Li Yiyue went to the northwest to investigate a case and met Beihai Longsan Prince Tong Ling and fell in love with each other. However, she was set up by the inner demon of the Immortal to turn them against each other.In order to save their lives, Yue Lao erased their memories, and the two were separated from each other.Three years later, Li Yiyue and Tong Ling met unexpectedly. The two fell in love with each other again by chance, and worked together to eliminate the nightmare and save the world.