Following the mercenary ambush orchestrated to extract the clone for corporate buyers, Ki-heon successfully isolates Seo Bok in a safehouse. However, Seo Bok refuses to simply stay hidden; he demands to visit a specific coastal town. When they arrive at a remote columbarium, Ki-heon discovers the secret origin of Seo Bok: Dr. Lim Se-eun created him using the DNA of her young son who died years earlier in a car accident. Seo Bok is painfully aware that he is not a real son, but a replacement experiment designed to assuage a mother's grief while acting as an immortal laboratory resource.
Captured and returned to the high-tech bunker, Seo Bok witnesses Dr. Lim being murdered by corporate mercenaries led by Shin Hak-seon. Pushed beyond his emotional breaking point, Seo Bok unleashes his dormant psychic power. In an overwhelming display of telekinesis, he collapses the bunker's physical infrastructure, obliterating waves of heavily armed tactical soldiers, crushing vehicles, and executing Shin Hak-seon and the attacking forces.
When Director Ahn's government forces arrive with heavy weaponry to execute him, Seo Bok creates a massive defensive perimeter. Exhausted from cellular degradation and refusing to live as an eternal laboratory guinea pig or a weapon of mass slaughter, Seo Bok looks to Ki-heon. He begs Ki-heon to shoot him, knowing that Ki-heon is the only person who sees him as a human being. Weeping, Ki-heon honors Seo Bok's final wish, raising his gun and firing the fatal shot. Seo Bok dies in Ki-heon's arms, finally achieving peace. In the aftermath, Ki-heon visits the tranquil seaside where they once stood, placing a stone upon a cairn, fully at peace with his own impending death.