Jonggun lives alone as a rich man who is handsome and dashing. He always works in the office until he realizes that he has a younger sister who is so perfect that Jonggun is even attracted to her.

That's what makes Jonggun so obsessed with his little sister and wants to take her just for himself, so many women love Jonggun, but he only wants her little sister.

Jonggun was working at that time, he started thinking about pouncing and doing anything to get his little sister, even in a heartless way, even the murder of his sister's close friend.

I will kill whoever takes you from me!..you are only for me..you understand!