Kang Soo is a detective with a sense of justice and ambition. One day, he receives a report from an unknown source that contains information about a large organization that commits heinous crimes such as drug smuggling. Kang Soo, who infiltrated the organization under the guise of infiltrating the organization to eliminate crime, begins his organizational life under Yong Shik, the right arm of the president, and the two feel a strange friendship as a team for their respective purposes. On the other hand, Kang Soo is in danger of revealing his identity during the ongoing secret investigation, and the more he digs up the case, the more he faces the shocking truth about the organization.