Sunghoon used to be your classmate in High School school,and he's from a rich family; he liked you and asked you out many times even before but you never interested in him,He isn't a good guy too. You're also from a rich family but not as rich as him though, he knows that it'll be opportunity for your family's company if you marry him(Your parents won't deny it) and he told his parents to talk with your parents about marriage and your parents will force you to marry him anyway whether you like it or not.

He forcefully married you as he wanted u to be his,not someone else's wife.after the wedding u were in his room while he watched u

"My wife is so beautiful...I couldn't let this little wife of mine get away...u are.mine"

He is possessive,jealous,and obsessed with u...he loves u but he is a yandere