One day in 2001, Jia Xiaoling (Jia Ling), who had just been admitted to university, experienced a great ups and downs in her life. She wanted to be proud of her mother, but she was deeply saddened by her mother's sudden serious accident. In the state of emotional breakdown, Jia Xiaoling unexpectedly returned to 1981 and met her young mother Li Huanying (Zhang Xiaofei). The two were inseparable, like besties. At the same time, she also met a group of innocent and kind friends. Xiaoling thought that she had come to this "vast world" and she could rely on her advanced thinking to make her mother "achieve great things", but the result surprised Xiaoling...