Song Shi On Chu Young Woo is a 22yearold university student who is majoring in contemporary dance His family disapproves of his lifestyle choices and career ambitions and after a major row he has been thrown out of the family home He resolves to pursue his dreams no matter what And the decision leads him to share a rooftop apartment with Jin Hong Seok Won Hyung Hoon The latter is a 28yearold debt collector for the lending firm Chachacha Capital working for the beautiful but moneymotivated CEO Cha Lee Soo Ryeon a woman who also appears to have a crush on him Jin Hong Seok has given up on his dreams to pursue a lucrative but unfulfilling career But spending time with Song Shi On changes his perspective on life and the duo forms a close bond that eventually turns romantic But social pressures as well as the affections of CEO Cha and senior student Jung Hoon LEX threaten to derail their fledgling love story