Insider

At a high-end gambling house, skilled judicial trainee Kim Yo-han risks more than he can afford as Mok Jin-hyeong pushes him to bet even higher.

Amid the countless inmates out to get him, Yo-han finds a person willing to take a chance on him. He makes his debut in the prison’s underground casino.

Yo-han hones his gambling skills under the masterful guidance of a mysterious neighbor. As his confidence grows, he begins to target higher-stakes games.

Jang Seon-o begins mentoring Yo-han, while Song Du-cheol seeks retribution. Meanwhile, Oh Su-yeon moves to form a strategic alliance.

Seon-o asks Yo-han to spy for him, while Su-yeon investigates the mysterious death of Yo-han's grandmother and its connection to an officer's suicide.

Seon-o promises to teach Yo-han the art of deception if he helps him take on Yang Jun. Meanwhile, Nam Dae-mun sees an opportunity to take power.

Yo-han finds a man who may be the key to tracking down his grandmother's killer. Hong Jae-seon monitors Su-yeon and blocks her investigation.

Yo-han uncovers the secret forces aligned with the Yang brothers. Meanwhile, Jae-seon searches for legal grounds to raid the prison.