In the Yunlan Kingdom of the fictional dynasty, Lin Wan and Su Jin, the daughter of an aristocratic family, have been close friends since childhood. They gave birth to two children: Xiao Chen, the heir apparent with a high-spirited personality and a cool heart, and Su Qing, a lively, cheerful and quirky girl. Xiao Chen and Su Qing's brother Su Mo are even more like brothers and are always by each other's side.
Xiao Chen has a deep love for Su Qing, who is seven years younger, but has been keeping it secret due to the age gap between the two. Su Qing is slow to respond to emotional matters, and they are a pair of happy enemies.
In an accident, Su Qing misunderstood that Xiao Chen had a sweetheart, and she decided to cut off this secret love out of frustration.
Xiao Chen: "You can only be my wife." Su Mo: "I treat you as a brother, and you want to be my brother-in-law!" Su Qing: "Does anyone ask my opinion first?"
