Introduction: Lin Yan is an undercover agent lurking in the underworld. He uses his high force value and strategy to navigate the edge of darkness. However, due to an accidental exposure of his identity, he falls into a life-and-death situation. His former allies turned against each other and gangster killers were chasing him. He thought he would fight alone, but he unexpectedly met Su Qingyuan, a female undercover who was also lurking. The two have different missions, but are forced to join forces due to fateful entanglements. While fighting against the pursuit of the underworld boss, they uncover the causal ties between each other's past. When the Gaowu duel encounters human calculations, Lin Yan breaks through the situation alone, and Su Qingyuan overcomes the obstacles with her combat power. This ultimate battle between the undercover and the underworld will eventually rewrite the dark pattern of the city with blood and fire.
