Adapted from Feiwo Sicun's novel - If I didn't meet you in this second - In Shanghai in the 1920s, Ren Susu (played by Wang Churan), the daughter of a drug dealer, led to the family's destruction in order to save the down-and-out young master Murong Qingyi (played by Zhang Linghe).Eight years later, she approached Murong as a lover to take revenge, but she pretended to die and disappeared because she found out that she was innocent.

Three years later, she turned into the daughter of a wealthy businessman in South China and returned to Shanghai, becoming Murong's fiancée. The two of them were tempted to deal with their old love.In the chaotic times of 1937, the two met again due to missions and eventually faced a life-and-death choice in the war.