In the summer of 1979, Shanghai.Late one night, public funds in the post office were stolen. Public security personnel rushed to the scene and found that the bus ticket seller Lin Qiang (played by Xiao Xiong) fell in a pool of blood and was sent to the hospital for emergency treatment.When Lin Qiang woke up, she did not say a word when facing the interrogation of the public security personnel, and seemed to have a hidden secret, which brought great difficulties to the investigation work.During the visit, Shangguan Jian (played by Huang Zhongqiu) found that Xiao Xiang (played by Shi Zhongqi) and Fan Zhu (played by Han Bingjie) had a different relationship with Lin Qiang, but the possibility of love was quickly ruled out.Through a detailed investigation and investigation, Shangguan Jian learned that Lin Qiang and Xiao Xiang often argued about educating their younger brother Lin Yao (played by Baoxun). He decided to attack the heart first and open Lin Qiang's knot.In the end, Lin Qiang told Shangguan Jian everything.It turned out that it was her uncondoning and pampering that led her brother to the path of crime...