Min-ho's adulterous lover Se-hee is murdered in a hotel where only the two of them were present, and Min-ho is immediately singles out as the prime suspect. Insisting on his innocence, Min-ho hires the talented lawyer Shin-ae to defend him, and confesses to her that a car accident on the day before may be connected to Se-hee's murder.

The four stories that possibly or impossibly can be happened in the pension; The parents who lost their child go to the pension with poison where the killer stays with his family; The husband and wife on a trip who are growing tired of their married life and the wife’s hidden secret reveals when they reach the pension; A woman who demands to stay a night at a particular suite to save her kidnapped child; A man who is asked to manage the pension for a night, he organizes fantastic night with his girlfriend, but things go wrong…