At 23, Ren Hao struggles with unemployment and a lack of romantic prospects. To cover his expenses, he decides to rent out a room in his home. However, when showing his first tenant, Lili, around, they encounter a vampire named Vivian attacking her, revealing Lili's true identity as a werewolf. As Ren Hao and Lili begin sharing the house, Ren Hao is recruited by an organization tasked with regulating parallel universes. Soon, a series of peculiar creatures become unexpected tenants under his roof.