Two women began to live with a man who lived alone. These women introduced themselves as sisters looking for their long lost father, and then began to seduce the man. In fact, these women are a pair of serial killer, only for men living alone. In the end, this person lost his life. During their celebration, one day, a boy who claimed to be a male brother appeared in front of them. He looks and sounds the same as that man, but his personality is completely different, unlike anything these two women have seen before.