Drug dealer Li Shangdao (played by Yoo Seung-bum) manages a golden area with thirty thousand customers, living in luxury apartments and enjoying a life of wealth and glory. However, one day, he is caught off guard by criminal police officer Dao Jingzhang (played by Hwang Jung-min), who discovers his weakness. Under Dao Jingzhang's threat, Li Shangdao has no choice but to assist him in a tricky case. Unfortunately, the mastermind Zhang Zhe escapes, and drug dealer Shangdao ends up accidentally in prison.The mastermind Zhang Zhe comes back into the sights of Officer Dao Jingzhang, who seeks out the now-released Shangdao to collaborate in capturing Zhang Zhe. However, Shangdao, having already spent 8 months in prison because of Dao Jingzhang, refuses to cooperate this time. To persuade Shangdao, Dao Jingzhang helps him reclaim his drug trafficking territory and provides him with a substantial business fund. Shangdao infiltrates Zhang Zhe's organization and starts drug trafficking freely, while Dao Jingzhang turns a blind eye, hoping to obtain useful information from Shangdao.To bring Zhang Zhe to justice, Dao Jingzhang must infiltrate the core of drug trafficking: the drug manufacturing site. However, Shangdao, who has become addicted to the drug trade, has not sent any news to Dao Jingzhang for three months.