three years ago, due to the intelligence error of detective liu yuanwen, his fiancée and the newly-formed detective rong yu died and the drug dealer was in trouble. aaa。 the criminal police officer of the anti-drug brigade, rong yao, became enemies with his good brother liu yuanwen due to his sister's death. liu yuanwen left the police station in a disheartened manner and disappeared. in order to avenge, rong yao became the captain of the yungang anti-drug brigade after three years of continuous efforts. to destroy drug trafficking K the group also dug out the "ghost" behind the international drug trafficking organization leader. the municipal public security bureau drew resources to establish the "84 group". honor resolutely took over the position of group leader for revenge, but unexpectedly, the first task of the group was actually for " K” liu yuanwen, the only remaining undercover agent in the group, provides support to help him get to the top and contact him K organizational core. therefore, the ruthlessness of reality made the two people who were tortured by fate choose to cooperate again. as they approached the truth step by step, the two found that rong yu might still be alive.