This drama tells the journey of an undercover police officer to infiltrate a major crime syndicate. This syndicate often distributes illegal drugs. Presenting a storyline that is unexpected or even has a surprise effect, even though many Korean detective themed drama have already been recognized, this story is fresh and hard to predict, it is not monotonous, the audience is also shown how persistent a police officer is in eradicating crime, especially in dismantling large organizations or Drug Cartel. Set in the 1990s, this drama series looks more natural with good cinematography. In my opinion, many people like dramas with criminal themes like this because the unique storyline shows each case and how to solve a case and how someone can stand their ground and remain strong until the end.