When a person dies in vain, if your resentment accumulates to a level greater than that of a ghost, the system will pull the person closest to you into a death loop, but it will not be triggered immediately. They will maintain a normal life. If the entrusted person dies, the entrustment will fail and the resentful spirit will turn into a ghost. The death loop is activated only when the client dies in vain. They must find out the origin event and eliminate the original owner's resentment before they can return to normal life. Otherwise, different ways of death will be triggered again and again. After each death, the death loop will restart, returning to an uncertain time before the origin event. The male and female protagonists are the lucky ones chosen by both the original owner and fate.
Concept: When emotions are accumulated to the extreme, they will explode, so will love, and so will hate.