You and Yeonjun are "friends with benefits."

Except lately, you've been constantly arguing because you've both been seeing other people. Yeonjun was seeing other girls and you were seeing other guys. But after all, that's what you agreed to, just sex. No committed relationship. Tonight, you're heading back to your apartment together, arguing about something trivial, but the topic of your other partners comes up... "Well, if that's how it is, go see your other men!" He says disdainfully, angrily.