Political pressure on the eve of the handover is tightening. The police urge Chen Zihao to collect Lin Yaodong's criminal evidence as soon as possible; within the gang, the second-in-command "Mad Dog Qiang" covets the leader position and secretly colludes with international drug trafficking groups to try to seize power; foreign forces want to take advantage of the chaos of the handover to turn Hong Kong into a drug transit hub. Chen Zihao walks on the edge of black and white. On one side is the belief in justice that he adheres to while wearing a police uniform, and on the other side is the "brotherhood" established in the gang; on the other side is the "mission" to catch Lin Yaodong for meritorious service, and on the other side is the "reality" of witnessing Lin Yaodong fight against external forces and protect the bottom members of the gang. When Lin Yaodong accidentally discovers Chen Zihao's undercover clues, when "Mad Dog Qiang" joins forces with foreign enemies to launch a coup, and when the police prepare to close the network, Chen Zihao must make the final choice between loyalty and betrayal, justice and crime - his choice will determine the fate of "He Yisheng", Lin Yaodong's life and death, and will completely tear apart his own life.
