Liu Jianguo, the captain of the Caiyun militia, was killed by drug dealers, and his brother, anti-drug policeman Liu Jianjun, was heartbroken. Later, his colleague Wang Kunyang discovered that Liu Jianjun often had contact with drug trafficking groups. Little did he know that Liu Jianjun was roaming among drug dealers in order to capture the largest local drug dealer, Amudong, and finally caught the drug trafficking group in one fell swoop under the deployment of the public security.