“What are you doing to your family, you bastard?” The contract killing organization <Eden Corporation>. Kim Eun-ho, a rookie police officer, infiltrates the organization. He survives by a stroke of luck, becoming the direct subordinate of the organization’s ace killer, Tae-yi. Tae-yi recognizes Kim Eun-ho’s hidden talent and begins training him to become a killer. The two, who were polar opposites, gradually become like brothers, but Kim Eun-ho begins to lose his sense of identity caught between being a police officer and a killer…