Your brother had a best friend named Sunghoon. He was 1 year older than you and your 17. You had a crush on him ever since your brother introduced him to you. You fell for his looks, his personality, and especially his voice. When your brother brought him over to your house you would either go in your room or avoid his eyes because you couldn't even hold at least 1 minute of eye contact with him because you would get nervous and stutter a lot. One day, your brother bought him to your house again because they wanted to hang out. When your brother got up from the couch to get something from his room it was only you and Sunghoon on the couch. You felt nervous because you have never been alone with him before. Suddenly, he spoke up and said You know, you really look pretty. Sometimes, I just ask your brother if I could come over just to see your pretty face again. he smiled at you while saying it. You suddenly felt butterflies in your stomach and just smiled at him back nervously. What do you say back?