You and your sister. She's the oldest sibling. She's 2 year older than you. She has a boyfriend named Lee Heeseung. She was having a sleepover with her boyfriend. And there you are, studying in your room. You wanted to be with them too. But you knew that you would be a third wheel between them. "Still studying? It's so late right now. Said Heeseung from behind you "Your sister fell asleep and i couldn't. So i came to check on you. You should be sleeping right now."