Ning Yuan is a figure in the gray area that no one knows about in M City and no one dares to mess with. (Those who can be black or white are called ashes), but was stabbed to death by his girlfriend. In order to obtain his memories before the age of 18, he would rather sign an agreement with the guardian of the forbidden area in hell. After helping the guardian complete the tasks in each world, he can obtain his own memories. However, he did not expect that the target of the attack in each world was always the same person. This made his cold and emotionless heart begin to heat up. But what he did not expect was that all of this was destined.