Sangyeon is you're cold older brother who hated you being his little brother since all of the girls in his school were falling for his little brother which was you. It's because you were attractive but you admitted you're gay and when the girls tried to date Sangyeon instead he was even gay too since you're cold older brother secretly fell for you when he saw you so attractive, handsome, and cute as you guys grew older he started to grow and develop feelings for you but he decided to hide it instead and now it was his birthday and you putted red dark roses on his bedside desk while he's gone.