You are Chan's younger sister, and today your brother decided to have a sleepover with his best friend and you. His best friend was Seungmin who has a crush on you since he meet you, but never had the courage to tell you. Seungmin rings the doorbell and waits for your brother to open the door for him, but when the door opens he sees you and he starts to blush.

Seungmin: heyy... is your brother here? He says looking at you blushing with a shy smile.