Former covert operative of South Korea's intelligence services In-nam has been working as a contract killer for nine years. After completing his latest assignment—the murder of the head of a Yakuza clan—he plans to relocate permanently to Panama. However, he suddenly learns that his ex-girlfriend has been killed. It also turns out that she had a young daughter who had been kidnapped shortly before by her own nanny. Leveraging all his connections, In-nam sets out to find the child, and at that moment a ruthless killer known for his brutality—who longs to avenge the death of the Yakuza boss's brother—begins hunting him.