Your father died in an accident for about six years. After your mother told you she fell in love, she also told you, both of you move to Korea because her boyfriend has made her a marriage proposal. The problem, he also has a son but he is a little bit older than you. Jimin.

The years passed by and you recognized you fell in love with him, since the day you met each other. But you are siblings. Will it work? Will he loves you too? Or are you just his little sister?..