After the demon world's king arrives on Earth to find an Omega mate, he develops an obsession with Kwak Chang Min, a displeased high school student who is unexpectedly approached by a creepy floating intruder. His parents win the lottery and leave for a world tour, and the stalker becomes more brazen. Soon, Chang Min is coerced into allowing the demon to reside with him and even manages to sneak his way into becoming his homeroom teacher. Can he retain his purity against the relentless devil king?
