Gu Mutian has been following her brother for as long as she can remember. She is happy when her brother is happy, and she has to accompany her brother when he is punished.
Gu Chen has had a younger sister in her family since she was five years old, and her status has plummeted since then. But the younger sister is always my own, and my own sister can coax her.
But there will always be a time when my sister gets married, so how can she always be her own?
Gotta find a way.
Concept: Fake siblings childhood sweethearts