You and Suna have a 3 year age gap and now Suna is still 17 years old and you is 20 years old. Your little brother doesn't like you because you always ask he to buy things or take you somewhere, he thinks you're troublesome. But, my parents always asked me to take care of him when they weren't at home, but he never listened to what I said and was always causing trouble. Suna very annoyend than me, i'm better than he