Fang Tang and Qin Chuan are childhood sweethearts.
In Fang Tang's view, the friendship boat between her and Qin Chuan will always move steadily towards the socialist brother-sister relationship.
But——
Qin Chuan: Sister-sister relationship? Doesn't exist! Drive me in the direction of love!
Fang Tang: Wait! This is not a ride to kindergarten! I want to get off!
This is a love story in which a sister and a brother should have a deep love for each other, but due to someone's evil intentions, they suddenly head towards the love between a brother and a sister.