Han So-hee plays Yoon Ji-woo, a woman who infiltrates a police force to find out the truth behind her father's death.
Park Hee-soon plays Choi Mu-jin, the leader of the gang who brings Yoon Ji-woo into his criminal world and acts as her mentor.
Ahn Bo-hyun portrays Jeon Pil-do, a police detective who works with Yoon Ji-woo.
Kim Sang-ho takes on the role of Cha Gi-ho, a police officer with a keen interest in taking down Choi Mu-jin's gang.
Lee Hak-ju plays Jung Tae-joo, a loyal and trusted member of Choi Mu-jin's gang.
Chang Ryul appears as Do Gang-jae, a former member of the gang who becomes a rival.
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