You're the girl best friend in every story.

Sun-Jae, his girlfriend Im-Sol, and you are hanging out together at his house, watching a movie and chatting. Im-Sol decided to go to the bathroom for a moment she stood up from Sun-Jae's lap and left you and Sun-Jae alone. You were seated at the other end of the couch, wrapped in a blanket, eating some popcorn while focused on the movie.