In a bid to uncover a sinister organ trafficking ring, Hong Kong undercover cop Kit infiltrates the criminal underworld only to find himself trapped in a Thai prison, lost to his colleagues and family. As Kit's situation becomes increasingly dire, he crosses paths with Chatchai, a righteous prison guard desperate to save his sick daughter with a crucial bone marrow transplant. Unbeknownst to both, their fates are intertwined not only by their personal struggles but also by the enigmatic and dangerous figure operating behind the scenes.

As Kit and Chatchai navigate the perilous circumstances imposed by the crime syndicate, their mutual objectives gradually align, leading them to form an improbable alliance. The lines between friend and foe blur as they fight to expose the corruption that binds their lives together. With deceit running rampant and time running out for those they hold dear, their collaboration challenges the omnipresent threat of the underworld, setting off a relentless chain of events that brings them face-to-face with unimaginable stakes and life-altering decisions.