Hee-su (Jeon Do-yeon), an unemployed single woman who has hit rock bottom aimlessly roams around a racetrack and inadvertently finds her ex-boyfriend, Byeong-un (Ha Jeong-woo) from years past doing the same. She remembers the large sum of money he had borrowed from her that he never bothered paying back. Byeong-un, who now lives a nomadic life, moving from place to place out of his backpack, takes it upon himself to pay off his debt to his ex-lover by asking for money from all the women he had been with during his philandering days after his relationship with Hee-su.
