Sung-yeol and Woo-hyun are two 18-year-old boys who are both tormented by the emotional scars of broken families; Woo-hyun longs to see again his mother who left him as a child, while Sung-yeol lives with a stepmother that he detests and whom he blames for the break up of his parents' marriage. Both are considered asocial by Korean norms, although popular, brave and public spirited Woo-hyun drifts through school refusing to apply himself to his studies; Sung-yeol is studious and does well academically but is dismissive and disrespectful of his parents, aloof and detached from his classmates, appearing cold and arrogant to all. The lives of the two crash together when an angel falls from heaven.