"Due to an abrupt overseas business trip by Ga-eul's parents, she finds herself in a precarious situation, secretly living with her childhood male friend Hyuk Won. They've been inseparable since childhood, and now with Ga-eul's parents away, they're sharing a roof. However, Ga-eul harbors a crush on someone else. Determined not to get caught living with another guy, she asks Hyuk to keep their arrangement under wraps. Despite his feelings for her, Hyuk agrees. But right from their first day together, they face the risk of being discovered by Han. Will their covert living situation hold up?"