A female white-collar worker who had just entered the society suddenly picked up a black cat when she came home from overtime work late at night. From then on, her life changed drastically. The secret messenger from the underworld, the escaped King of Hell, and the immortal from Kunlun all made her originally peaceful life turn into a mess. Sudden love, a conspiracy that has been hidden for many years, a civil servant from the underworld and a Kunlun immortal are having sex? As a mortal, where should she go?