Kim Ji-yong leads a double life as a Korean National Police University student by day and the Vigilante by night, personally punishing criminals who evade the law. He is surrounded by people who all possess different ulterior motives.

• Nam Joo-hyuk
• Yoo Ji-tae
• Kim So-jin
• Lee Jun-hyuk
• Kwon Hae-hyo
• Lee Seung-woo
• Lee Seo-hwan