In Hong Kong, which is full of crisis and darkness, Yu Tianhong is a carefully trained undercover policeman who goes deep into local criminal organizations and lurks in the abyss of crime. His mission is to expose a vast network involving drug trafficking, smuggling and gang warfare. In order not to expose his identity, Tianhong was forced to establish complex relationships with gang members. Every step he took was full of danger and uncertainty. In this world full of betrayal and conspiracy, he not only has to face the threat of his enemies, but also struggles with his own moral bottom line. As the mission progressed, Tianhong began to feel the erosion of darkness, and his inner struggle became more intense. As he gradually wins the trust of the gang leader, he accidentally discovers a larger conspiracy, and he must make a difficult choice between keeping his identity secret and saving innocent people. In danger, can he find light in the darkness and complete his mission, or will he be swallowed up in this endless abyss?
