is a 2022 South Korean action-suspense thriller following a judicial trainee who enters prison undercover for an investigation and finds himself embroiled in a high-stakes survival game. Core Story & Plot
(Heo Sung-tae): A powerful and corrupt chief prosecutor.
: He forms a tense partnership with Oh Soo-yeon , a successful businesswoman with a dark past seeking her own retribution, and Jang Sun-oh , a gambling genius who controls the prison's underground games. Cast & Characters is a 2022 South Korean action-suspense thriller following
(Lee Yoo-young): An ambitious businesswoman who assists Yo-han for her own vengeance.
The show consists of and was originally broadcast on JTBC in 2022. It is available for streaming on platforms like Viki and Netflix . Watch Insider | Netflix Watch Insider | Netflix (Kang Ha-neul): A judicial
(Kang Ha-neul): A judicial apprentice who transforms from a naive student into a hardened "insider".
: His mission goes sideways when his superior is murdered and his colleagues disown him, leaving him "trapped" as a real prisoner. and Jang Sun-oh
The series revolves around , a meticulous judicial trainee who lives with his grandmother.