In a bustling Hong Kong, an officer from the Royal Hong Kong Police, dedicated yet haunted by past experiences, finds himself embroiled in a complex case after a daring arms deal goes awry. The failed transaction leaves one suspect dead and a young girl, the victim’s daughter, orphaned and alone. As the officer delves deeper into the investigation, he discovers the girl’s mother, who quickly becomes a person of interest due to her tangential involvement in the deal. Despite initial skepticism about her role, he begins to see her more as an unwilling participant rather than a criminal, igniting both professional and personal compulsion to protect her and unravel the truth. Their fates intertwine amid a backdrop of mounting tension and danger.

As the investigation intensifies, they are drawn into a web of deception and betrayal involving dangerous criminals and corrupt officials. Their tentative trust is continually tested as they navigate increasingly treacherous situations. As they dig deeper, they must confront not only external threats but also personal demons that threaten to jeopardize their fragile alliance. Intrigue grows as they race against time to uncover the broader conspiracy and find justice for all parties involved. The narrative unfolds with growing intensity, showcasing themes of redemption, sacrifice, and the complex nature of law and morality. The two must navigate myriad adversaries while constantly grappling with their evolving relationship in a world thrust into disarray by greed and violence.