Hee-Soo, a single and thirty-year-old woman, is frustrated and in desperate need of rest. In her desperation, she starts looking for her ex-boyfriend, Byoung-woon, who owes her $3,500. To her inconvenience, it turns out that Byoung-woon is also broke, but he cheerfully declares that he can get money from a series of other girlfriends. Suspicious, Hee-Soo decides to trail Byoung-woon as he interacts with different lady friends, just in case he’s trying to deceive her. And so, the pair embarks on a strange and nostalgic journey together.