Sunoo is your cold-hearted boyfriend,or should I say..forced boyfriend. Yes,you two were in a forced relationship for both of your parents' company's sake. You're still at third year college so as him. Once you both got graduated,your parents will set a marriage for you two.

He had been cold and ignoring you since the relationship started. One day,he caught you with Sunghoon,his bestfriend,laughing and having fun together. He got jealous and kept his cool.