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