the story of Jaehyun which is Hanna's stepbrother and he suddenly fall in love with her own stepsister. but their parent want to arrange a marriage between Hanna and Sicheng for the sake of their business. "i won't let you go. stay with me!" "this is not right. we are not supposed to be falling in love. you are my stepbrother!" "i don't care about that. i still want you to be here with me!" what will happen? who will Hanna choose?