As the first snow falls in Seoul, two old friends reunite; one is a successful college professor, and the other, a struggling filmmaker recently returned from the United States. After their reminiscences, they finally decide to go in search of the young woman each had romanced years earlier.

Hwang Dae-woo is an elite with zero experience on having a romantic relationship. One day, he meets a lovely, sophisticated woman and falls in love with her. Then, he encounters a terrifying secret about her.

No pain, no gain. This is the motto of the Yoo family: the father is a successful doctor, the mother supervises their daughter's scholastic performance from the vantage point of their beautiful home. Then cracks appear in the facade which soon deepen and spread. In particular, the father seems to be losing control - he is suddenly faced with a sexual harassment lawsuit and an absurd running battle with a taxi driver.

Kim Sun-woo is an enforcer and manager for a hotel owned by a cold, calculative crime boss, Kang who assigns Sun-woo to a simple errand while he is away on a business trip; to shadow his young mistress, Hee-soo, for fear that she may be cheating on him with a younger man with the mandate that he must kill them both if he discovers their affair.