Shen Qi (Fu Mengni), the 18-year-old lead singer of the band "Red Star Society Second Generation", hit it off with Fang Jiacheng (Zhang Zhilin), a graceful middle-aged man who had just returned from Hong Kong, in an accident. Fang Jiacheng hid the secret that he was unemployed in Hong Kong and had to return to Shanghai from his mother, and in an instant "kidnapped" Shen Qi to be his girlfriend. Shen Qi, who was just beginning to fall in love and didn't know how to be romantic, was out of control. She got drunk in bars, shouted wildly by the river, invited to sing on the spot, begged and begged, Loli is not good at love, she can only call for true love. Fang Jiacheng seemed to respond, but he was hesitant. After all, a memory from 20 years ago kept bothering him and he couldn't let it go. How could he feel. Just when Shen Qi gave up and decided to go to Australia to study, an old box fished out of the Huangpu River revealed the secret of an extraordinary time and space...