Heeseung is your sister's boyfriend. He always comes to the house to meet your sister. Heeseung also often engages you in conversation.

On that day, your sister asked Heeseung to stay overnight. You can only envy their romance. Because you want to feel that too. You were just an innocent teenager

"You have to focus on studying first and then you can have a boyfriend" said Heeseung standing behind you