In Xinhai City, memories can be repaired, stored or even deleted. Lu Chen is the top memory restorer in the industry, but he has ironically forgotten his past and suffers from scattered dreams. One day, a mysterious woman named "Zero" came and made an incredible request: to delete a warm memory about the lighthouse. When Lu Chen dived into this memory, he was shocked to find that the protagonist of that memory seemed to be himself. In order to regain his identity, Lu Chen stepped into a huge conspiracy woven from memory fragments. He must piece together the truth before he is completely forgotten, and that seemingly weak woman is the only beacon to the island of his past, but it may also lead him to the deep sea of oblivion.