In-nam (HWANG Jung-min), a Korean assassin residing in Japan, has just completed what he intends to be his last assignment. Shortly thereafter, he discovers that the daughter of a woman from his past (CHOI Hee-seo), now living in Thailand, has been abducted. Determined to rescue the child, he travels to Southeast Asia, making a quick stop in Incheon, where he receives assistance from Yoo-yi (PARK Jung-min), a bar employee. However, In-nam is not alone on his journey to Thailand; he is being pursued by the ruthless gangster Ray (LEE Jung-jae), who seeks revenge for the recent murder of his brother by In-nam.