Misbehavior (film)

"Female Teacher") is a 2016 South Korean psychological thriller film written and directed by Kim Tae-yong.

One night, Park Hyo-joo discovers Cha Hae-young having sex with a student named Shin Jae-ha.

In the following days, Park Hyo-joo enrolls Shin Jae-ha in ballet classes, to support him for an upcoming competition.

Later, he maliciously reveals to Park Hyo-joo that their affair was initiated to give Cha Hae-young leverage over her.

She calls Shin Jae-ha at the room, and they have sex, but he asserts that he only loves Cha Hae-young and not Park Hyo-joo.