Fang Yi, a social worker, unfortunately died in a car accident while crossing the road to see a handsome guy. When he came to the underworld, he discovered that the King of Hell was his ex-boyfriend Lin Yue who had been dead for two years. I thought I could renew our relationship, but Lin Yue pretended not to know her, and said that because of her excessive lust, she had to work in the underworld for a full period of time before she could be reincarnated. In order to be reincarnated as soon as possible, Fang Yi had no choice but to become the assistant of the King of Hell, and from then on he began a journey of "falling in love and killing each other" with his predecessor in the underworld. In the underworld, Fang Yi not only has to face bizarre work tasks and various difficult ghosts, but also solves the mystery of Lin Yue's amnesia and explores the secrets hidden behind the underworld. And as the two get along, their former feelings seem to be slowly recovering...