The Key

An erotic film about two women who have relationships with each other’s boyfriends.

Two couples go on a trip to a pension. Due to the owner’s mistake, they make reservations for the same day and have no choice but to stay together. It turns out that Min-ji, Woo-yeong’s girlfriend, knows So-yeong, who is Ji-hoon’s girlfriend. The two women awkwardly greet each other, and the four of them have a drink together that night. After Min-ji gets drunk and falls asleep first and Ji-hoon steps out to buy more alcohol, Woo-yeong and So-yeong are left alone and secretly have sex. However, Min-ji wakes up and witnesses the scene, feeling deeply betrayed. In response, she seduces and has sex with Ji-hoon, then confesses everything to him.