In Bangkok, a solitary and efficient hitman named Joe operates under a strict set of rules to maintain his anonymity and safety while conducting deadly assignments. Tasked with executing four people, Joe hires a local street punk named Kong to be his errand runner, intending to kill him at the end of the mission to leave no witnesses. As part of his cover and to gather intelligence for his hits, Joe pretends to be a filmmaker, which allows him to scout locations and plan his assassinations with minimal suspicion. Throughout his mission, Joe demonstrates a methodical approach to his work, emphasizing careful planning and absolute discretion.

Amidst the chaos of his profession, Joe finds himself forming unexpected bonds that challenge his lone-wolf existence and stringent rules. He becomes romantically involved with a local pharmacist who is deaf and mute, finding a sense of connection and solace that he hadn’t anticipated. Simultaneously, his relationship with Kong evolves from a mere utilitarian arrangement to a mentorship, as he teaches Kong the skills of the trade. These developing relationships expose Joe to vulnerabilities and distractions that conflict with his meticulous nature and professional principles. This new emotional entanglement tests his ability to remain detached and imperils both his mission's success and his own survival strategy, leading him to question the path he has chosen.