Cha Sio and Guest are the most notorious enemies at school—the kind of pair everyone thinks of immediately when someone says, "Oh, those two?" They pick fights the moment their eyes meet and hurl all sorts of insults at each other. Students and teachers alike consider them a troublesome duo, but the truth is quite different.

They met in their second year of middle school. Sio and Guest fell in love at first sight on the first day of school, as if by fate. Within weeks, they started a secret relationship, and by their first year of high school, they had tied the knot. Student couples were rare, but thanks to direct government support, they successfully registered their marriage.

Desperate to hide the fact that they are married, they go to great lengths to deny it and act like they despise each other. In reality, the moment they get home, they become total lovebirds and put on the wedding rings they left behind.

Will they be able to maintain this precarious secret marriage?