In-nam, a skilled hitman, finishes a mission in Japan by eliminating a mobster named Koraeda. Back in Thailand, Young-joo sends her daughter Yoo-min to school and arranges for a babysitter to pick her up, while she meets real estate agents to discuss a golf-course investment. When Yoo-min steps off the school bus, the babysitter instead drives away with her husband in the car, and Yoo-min disappears.
The search for Yoo-min begins with a grim realization. Young-joo reports the kidnapping to the police and seeks help from Chun-sung, who initially warns In-nam but is met with rejection when In-nam refuses to get involved. The next morning, a message arrives: Young-joo is dead. A flashback reveals a different past—eight years earlier, In-nam is part of Korea’s National Intelligence Agency, and Chun-sung is his superior. The two once shared a romance with Young-joo, and In-nam was ordered to leave Korea to protect her.
Present-day In-nam travels to Incheon to grieve over Young-joo’s body and to learn that Yoo-min is his child. He visits Chun-sung for answers, only to be drawn into a new thread of violence when Shimida relays that Ray, Koraeda’s estranged younger brother, is seeking vengeance. Ray eliminates Shimida, then heads to Incheon to kill Chun-sung, and follows the trail to Thailand where In-nam is headed to locate Yoo-min.
In Bangkok, In-nam crosses paths with Young-bae, who briefs him about Jong-su, a fraudulent real estate agent connected to Young-joo. Jong-su is implicated in Yoo-min’s kidnapping, and In-nam tracks him down and leaves him to die. Parallel to this, Ray wipes out a gang that lied to him about clipping Yoo-min’s trail. In-nam then locates the babysitter’s home and tortures the couple for information, while Young-bae brings in Yui, a transgender woman, to assist.
With Yui’s help, In-nam discovers a grim truth: the operation is a child-trafficking network purposed for organ transplants. Yoo-min has already been moved to Lang Yao for a heart transplant. Ray arrives at the same building and the two men collide; In-nam escapes but the chase continues. Yui and a child also escape, yet are later arrested. That night, Thai police raid the building belonging to the Chaopo crime organization. Lan, Chaopo’s boss, commands his men to kill In-nam and Yui. In-nam pushes on toward Lang Yao.
In Lang Yao, In-nam discovers Yoo-min being prepared for surgery at a football factory. He gives chase, but Ray intercepts with lethal intent. The police arrive and shoot both men, allowing In-nam to slip away, kill the surgeons, and rescue Yoo-min. Chaopo’s network is exposed and the operation is disrupted. Ray storms Lan’s home, pleading for help to capture In-nam and killing Young-bae in the process.
The next day, In-nam and Yoo-min check into a hotel, planning a route to escape. The moment they settle back in, Chaopo’s men ambush the hotel and Ray hides among them, intent on dealing with Yoo-min first. In-nam is dragged away, and Yui arrives just in time to ram a van and free him. A fierce pursuit ensues, culminating in a brutal confrontation where In-nam fights Ray, detonates a grenade, and ultimately sacrifices himself to protect Yoo-min. He dies beside the chaos, but not before ensuring Yoo-min’s safety.
In-nam leaves behind a bag of cash and documents in a locker, later unlocked by Yui. He hopes Yui will take Yoo-min to Panama in case he is killed. Yui and Yoo-min depart for Panama, signaling a fragile, hopeful future. A photo frame in their Panama home shows In-nam alongside Young-joo, with Yoo-min nearby—an emblem of the family that nearly found its way back, even as the world around them remains dangerous and unresolved.
