The series is about an incident that takes place when the owners of the boarding house called 'Guest Summer Palace', which breaks stereotypes, and boarders with secrets gather to find Lee Seol who disappeared 13 years ago.

Jin Woo doesn't want a roommate—or to fall for one. But Ki Sub moves in anyway, turning quiet disdain into something far more complicated.

Two young teenagers who are also best friends fall in love.

Jin-woo is new to romance, so he dreams of the best partner. Then Gi-seop, tall and good-looking but shallow, gets Jin-woo's attention. Jin-woo thinks Gi-seop is never enough for him, but at the same time, he can’t stop thinking about him. As Gi-seop is used to being the one asked out and always saying yes he wonders why Jin-woo does not make a move. But then it hits him: Jin-woo's standards are sky-high. So, he decides to move in to Jin-woo's house. Living together, they keep bumping into each other and one accidental kiss stirs them up.