Because of an incident in their childhood, Tae-eun’s father incurred a debt to Suyoung’s family and has been sending them 1 million won every month. Years later, the two meet again as adults—he as the newly appointed team leader and she as the youngest member of the team—beginning a tense and delicate office life together. “Team leader, why are you so kind to me?” “Because I owe you a debt.” “Then why do you seem to dislike me?” “Because I’m not sure that debt is really mine.”