"I'll help you. With your romance." Creak, creak― Sociability: zero! Kim Choi becomes the master of the secluded 'Second Library'. One day, she gets her most hidden unrequited crush exposed by Lee Do-jin, an uncomfortable senior who intrudes upon her space. Wait, what is this guy up to... Offering to help with her crush, but the condition is to date him?! Is it a transaction, or hidden desires? That summer, a very private youth romance unfolding in a secret place.