The series stars Nam Joo-hyuk, Yoo Ji-tae, Lee Joon-hyuk and Kim So-jin.

[4] Kim Ji-yong, a student at the police academy in South Korea, becomes the "Vigilante" at night and punishes criminals, who receive light sentences for heinous crimes.

Ji-yong's actions catch the attention of Jo Heon, the head of an investigation team.

[2] Nam Joo-hyuk was cast to play lead role in the series in April 2022.

[10] Yoo Ji-tae gained 20 kg of weight to realistically portray Jo Heon, the head of the metropolitan investigation team chasing Vigilante.