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Baoyu (played by Lin Shen) is an undercover police officer infiltrating a drug trafficking gang. After years of investigation and gathering evidence, he finally dismantles a drug den. Baoyu, who thought he could finally leave the dark and nerve-wracking life behind and return to the police force, is assigned another mission. Another drug trafficking gang is rapidly growing, and it has close ties to the gang he had infiltrated. The daughter of the drug lord, Tangguo (played by Li Qin), is kidnapped by an enemy. Fortunately, Baoyu intervenes and rescues her, giving him the opportunity to penetrate deeper into the enemy's ranks. However, his true identity is constantly under threat of exposure. To ensure Baoyu's safety, Chief Inspector Fang Qinglong (played by Zhang Jiayi) sends Detective Qin Yue (played by Zhai Tianlin) to secretly support him. On the path of balancing love and law, loyalty and morality, Baoyu ventures further and further.