The dividing line

The laid-off worker Ma Dongsheng (played by Zhang Guoqiang) robbed a "black shop" while masked because his daughter Ma Jin suddenly became seriously ill. The owner of this store, Li Bing, raped Ma Dongsheng's apprentice back then. The criminal police captain Yu Chao (played by He Bing) in charge of the case was actually an acquaintance. But this case brought out a corruption case and a major drug production and trafficking case. Li Bing's brother-in-law, deputy mayor Chen Zitao, tried every means to cover up the truth and even created a farce that would make people blame him. Unexpectedly, Ma Dongsheng did not escape. He exposed the conspiracy to Yu Chao in an anonymous letter and promised that he would surrender. As the case was solved, Yu Chao realized that the suspect was Ma Dongsheng, and also found out that Ma Jin's illness was actually caused by a "human experiment" by a drug manufacturing and trafficking gang. Tan Jiping, deputy director of the Municipal Public Security Bureau, who was controlled by Chen Zitao, acted as a "protective umbrella." However, Yu Chao's dedicated character also moved Ma Dongsheng, and he chose to surrender. This was Yu Chao's last chance for him.