The coastal international metropolis "Dragon City" has flashing neon lights, but it hides an intricate undercurrent of underworld. Chen Mo, the son of a police officer, bears the blood feud of his father being framed and killed by the veteran gangster "He Sheng Lian". He infiltrates the gang as an undercover agent as "Ashes". With his ruthless skills and careful thinking, he gradually rises to become the "Red Stick" next to the leader Luo Tianhao. On one side is the order from police liaison Gao Jian, asking him to destroy He Shenglian's criminal center; on the other side is the admiration and suspicion of the scheming Luo Tianhao, and the pressing step by step of the ambitious veteran Lei Bao; and the leader of the emerging force "New World" A Gui uses crazy methods to attack the old order, turning the Dragon City underworld upside down.
The appearance of hospital doctor Shen Xinyue is the only light in Chen Mo's gray world, but it has also become his fatal weakness. As the identity crisis looms, gangs fight and blood boils, and the truth about his father's death gradually emerges. Chen Mo is repeatedly torn between justice and revenge, loyalty and betrayal. He not only wants to survive in the gang fight, but also protect the light in his heart, and he also needs to find his own path to salvation in the endless abyss - in this undercover chess game with life as a bet, will justice defeat evil in the end, or will he eventually sink into darkness?
