What Happened Last Night

Yoo-jin is a single woman with multiple boyfriends who wakes up in an unfamiliar hotel room. With a blurred memory of the night before, she begins to list potential suspects to discover who she might have spent the night with. Among those is Cheol-jin, her shy best friend since college, but she doubts it could be him.

The film explores themes of love, friendship, and the complications that arise in romantic relationships. As Yoo-jin navigates through her uncertainty, she serendipitously encounters her first love, Seok-kyu, adding another layer to her already tangled situation. The comedic elements come from her attempts to unravel the mystery of her drunken escapade, leading to humorous and unexpected revelations.