A new type of robot 7723 (voiced by Han Yingdi) that is about to be used to save mankind, by chance, meets Su Xiaomai (voiced by Zheng Haiyin), a naughty girl who loves football. Xiaomai, who seems to be naughty, grew up in an incomplete family. Her father left home to pursue his dream, which affected Xiaomai's growth and made her indifferent and withdrawn. The appearance of 7723 also made this pair of happy enemies gradually become a pair of close friends in love and hatred. However, the good times did not last long. Boss Pang (voiced by Feng Yuanzheng), who dreams of destroying mankind, tracked down the whereabouts of 7723. However, the gentle colors and brilliant times engraved with Xiaomai's name have already left an indelible mark in his life...