Song Shi On is a university student who is majoring in contemporary dance. After a major row, he has been thrown out of the family home and is left with an emotional wound. He decides to pursue his ambition and ends up sharing a rooftop apartment with Jin Hong Seok. This cold but attentive man works as a debt collector for the lending firm Chachacha Capital and has abandoned his dream of becoming a pianist. As the duo forms a close bond, the affections of CEO Cha Sa Jang and the jealousy of senior student Jung Hun threaten to derail their fledgling love story.