Twenty-year-old Yin Yun came to Shanghai alone to become a tutor for the son of Sun Xiao, a well-known Shanghai businessman. Master Sun Beibei has a strange identity. He has been without a mother since he was a child. He has a surly temper but is obedient to Yin Yun. In the process of taking care of Beibei, Yin Yun gradually became acquainted with Sun Xiao, who also concealed a bloody feud, but she was also passively involved in the interest struggle between Sun Xiao and Wen Hongfu, the president of the Shanghai Chamber of Commerce. Sun Xiao rescued Yin Yun several times, knowing clearly that Yin Yun had feelings for him, but Yin Yun always backed down at the last moment. In order to get Yin Yun out of the shadow, Sun Xiao gradually discovered Yin Yun's past experience.
After the Battle of Songhu, Sun Xiao's best brother Xie Siyi participated in the anti-Japanese war. In order to protect Yin Yun and Siyi, who had already been secretly targeted by the Japanese, Sun Xiao had to cooperate with the Japanese. He was reviled by others, and finally ended up on the assassination list organized by Xie Siyi. Sun Xiao could obviously escape, but in order to prevent Xie Siyi from being suspected by the organization, he was willing to be killed by him. Xie Siyi regretted it in the end. Yin Yun settled Beibei and went to the residence of the Japanese general alone to begin her final journey of revenge...