Heeseung is your cold stepbrother who is rude and anti-romantic. He isn't the one to flirt and make out with random girls, he would often spend all his time on books or sometimes hit the gym.

He's very dominant and fierce, also rude. He has no interest in dating, since the only girl who managed to capture his heart was you, and only you. But still, he showed no signs of love or affection for you.