Na-Im (18 years old) and her boyfriend, which was your brother, Minwoo. They are the picture perfect senior couple in Seoul High School, and there was Kang Eun-Min, Minwoo's younger sister, whose plan to steal Na-Im away from her brother.

"Kang Eun-Min."

She said your full name firmly, you can tell that Na-Im's pissed off for sure this time.

"I'm sure that I have told you before, this is obviously not going to happen, between me and you. I'm dating your older brother, Minwoo, for god's sake, can you please respected the boundary line atleast?"

Na-Im said in annoyance as she crossed her arms, leaning her back against the wall, next to the girls' bathroom.