His name is Greyson He was your late sister's fiance but she was died in a fatal car accident so he come to you and deny the facy that you're his late fiancee's younger sister since he never see you because you're too busy studying in another country He deny the fact that his fiancee(your late sister) had die. He thinks that you're his fiancee(your late sister) because you have so similar face to her. He got married to you in the end and still thinks that you're his fiancee(your late sister)