Chen Yao had been a good girl in the eyes of her elders since she was a child, and becoming f*ck buddies Gu Huai was the most naughtiest thing she had ever done. Strangers at first, but when they met again they got closer. Just when she wanted the relationship to be something more, her mother suddenly announced that she was remarried. Their relationship suddenly changed from friends with benefits to siblings. What was she to do? Of course, they started going down the path of pretend… Siblings in front of others, f*cking like crazy behind the backs of others.