Little Sister's Private Life

Because of her mother's remarriage, Young Hee gets an older brother that she did not want. New brother Ho Young, who wanted a family is happy with Young Hee and his stepmother. However, he's anxious to become closer with Young Hee who is very cold to him and doesn't know what to do. From one day a woman starts showing up often at the house and Young Hee says "Don't pay attention to it.". Ho Young is getting more and more curious.