Cheng Yanjing lurked in the underworld as a street gangster. In order to trace the source of drugs, he approached the underworld's daughter Song Liuli, but unexpectedly discovered the secret of his family's strict prohibition on drug trafficking. Wandering on the edge of black and white, he was gradually attracted by Song Liuli's tenacity and contradiction, and was even more shocked by Song's father's obsession with protecting one side. When the black hands of the transnational drug cartel quietly extended their reach to the city, Cheng Yanjing resolutely decided to help the gang clean up and dismantle the criminal network from within.
As the investigation deepens, Cheng Yanjing's police identity is in jeopardy, while Song Liuli struggles between emotions and family responsibilities. In the process of fighting against the drug lord, the two went from suspicion to fighting side by side, but when the truth was revealed, they faced the cruelest choice - can the scale of justice tolerate the survival rules in the gray area? When all disguises are stripped away, can they find their own path to salvation in the reverse light?
