When he was very young, his father often told Gu Yiqing the same story. The protagonist of the story is not who he is, but the ever-quiet Luo Lake behind his home. Legend has it that there is a water monster living at the bottom of Luo Lake. It has lived since ancient times and is probably almost a thousand years old, but no one has ever seen its true face. The water monster is the curse suffered by Luo Lake and is also the protector of Luo Lake. Anyone who breaks the taboos in Luo Lake will be led towards the center of the lake by the water monster's call at midnight, until the lake is overflowing, people are drowned, and in the end even the body is not found. Mr. Gu thought that he was too naughty and his father had made it up to fool him, but he never thought that one day an invisible hand would ruthlessly push him into this story, leaving him with nowhere to escape.