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The notorious oil king Huo Qingsong, who dealt in illegal red oil, became a thorn in the side of both Hong Kong police and mainland security after an oil truck explosion. His business was forced to halt, his family began to turn against him, and competitors were closing in, leaving him besieged on all sides. Though seemingly unable to resist, Huo had secretly been planning for months. However, just as he was about to turn the tide and reclaim his power, his only son was kidnapped!

Senior Inspector Si Tu Mulian, a rising star in the police force known for her sharpness and efficiency, has a naturally cold heart which aids her investigative work but leaves her at a loss in matters of the heart. After pining for her boyfriend for over a decade without marriage prospects, and nearing the age where she risks becoming an older mother, she decides to cut ties with him—just as she is assigned the case of Huo Qingsong's kidnapped son! With his son taken, Huo mobilizes his entire gang in pursuit of clues, discovering that competitors have brought reinforcements from the mainland to target him. As his men prepare for war, Si Tu Mulian leads her team into the Huo residence. Unsure whether to go to war, Huo hesitates, knowing his men are opportunists and that someone within must be colluding with the kidnappers. Listening to Mulian's analysis, Huo decides to cooperate with the police to save his son. The police activate their highest action mechanism, code-named "Chenglong Operation," involving all Hong Kong police and even mainland security forces standing by! Captain Zhao Tianhe is summoned, unaware of the operation's details. His primary goal is to personally arrest the mastermind behind the oil truck explosion months ago.

Months earlier, Zhao received intelligence and launched a raid on the red oil group. During the operation, a pursued oil truck flipped over, crushing a private car and causing an explosion. A mother and child burned alive before Zhao’s eyes, deeply affecting him. Fortunately, the deceased husband Xu Banshan forgave him, and they formed a deep friendship. Collaboration between the police and underworld seemed like a far-fetched tale, leading to constant conflicts and stalling the investigation. Meanwhile, Mulian discovers she is pregnant, plunging her into emotional turmoil; Huo struggles to rescue his son while preserving his gang; Zhao learns the victim of the kidnapping is Huo, infuriating him! Just as hope dwindles for rescuing the hostage, a brutal gang battle turns Mulian and Huo from foes to allies. Simultaneously, Zhao uncovers that the mastermind behind the kidnapping is none other than Xu Banshan, driven by revenge…

In prolonged darkness, dozens of oil trucks across Hong Kong and mainland China explode for no apparent reason, prompting a massive joint effort by police and security forces in swift pursuit! As dawn breaks, the kidnapper Xu Banshan surprisingly surrenders himself! At the same time, under full police air, land, and sea protection, Huo Qingsong goes to exchange hostages—only to find the person arriving for the trade is Security Captain Zhao Tianhe…