In the darkness of the border, evil grows like weeds. In order to uproot the "Hongtu" drug trafficking group, anti-narcotics police officer Xie Chengyuan went deep into the tiger's den to work undercover. The engraved coins he carried with him were his beliefs.
Ye Wuqiu, a doctor at Wutong Town Clinic, seems ordinary, but in fact he is burdened with his father's unfinished anti-drug legacy, and the diary in his hand contains key clues. In an accident, the two met at a drug dealer's stronghold and found that they had a common goal.
After that, Xie Chengyuan dealt with drug dealers in a hail of bullets, and Ye Wuqiu provided support for him with his medical knowledge and wisdom. From an abandoned paper mill to a secret cellar, they uncovered the criminal network of "Hongtu" step by step, and also established deep trust in the test of life and death.
As the investigation deepens, the anti-drug stories of the two generations gradually emerge. It turns out that their fate has already been foreshadowed in the stories of their parents. In the end, can they completely destroy "Hongtu" and complete this anti-drug relay that spans time and space?
