Liu Jianyu, the captain of the militia in Caiyun Province, was tortured and killed by drug dealers, and his brother Liu Jianjun, an anti-drug policeman, was grief-stricken. Subsequently, his colleague Wang Kunyang discovered that Liu Jianjun often had contact with the drug trafficking group, but he did not know that Liu Jianjun was in order to arrest the largest local drug dealer A Mudong, and wandered among the drug dealers, and finally wiped out the drug trafficking group under the deployment of the public security.