At the border, an arrest operation unexpectedly failed, resulting in heavy sacrifices by police undercover agents. However, before the Luoshan Public Security Bureau planned a new operation, they found more and more evidence showing that Deputy Director Ye Chunsheng (played by Feng Guoqiang) of the Narcotics Control Team was the mole planted by drug dealers. Director Fang Guoan then ordered the secret capture of Ye Chunsheng.