Xiong Dan, a courier who practiced martial arts since childhood, comes from a small mountain village and has "chivalrous courage" that is incompatible with the values of metropolis. Once Xiong Dan delivered a courier instead of a colleague who had a car accident, and accidentally saved the recipient who was unconscious at home, but was mistaken for the perpetrator by Yang Yiyi, the granddaughter of the recipient.

Xiong Dan, a simple and kind courier who travels in big cities, has a strong sense of kung fu and dedication. He is optimistic by nature, full of sunshine, and always smiles. It was not until he met Yang Yiyi, a charming and energetic urban fashion witch, that everything began to change. Yang Yiyi played by Yao Di is full of personality, sometimes arrogant, sometimes nervous and sometimes demure.