Prison Playbook — Characters & Cast

To survive incarceration, rehabilitate his pitching mechanics, and return to professional baseball.

Begins as a simple-minded, emotionally detached baseball star thrust into imprisonment; through physical rehabilitation and deep bonds with his cellmates, he matures into a shrewd, protective leader who masters prison dynamics without losing his core integrity.

To protect Je-hyuk inside the dangerous prison walls and support his return to society.

An exceptionally talented individual prone to quitting when things get difficult; serving as a prison guard, his rekindled friendship with Je-hyuk inspires him to embrace deep professional commitment and emotional openness.

To atone for his violent past and quietly guide younger inmates away from repeating his mistakes.

A former gangster serving a 25-year murder sentence; transforms into the benevolent father figure of Room 6 who seeks no excuses for his crime, finding redemption when granted parole and discovering his biological daughter.

To overcome his chemical dependency and reunite with his long-term partner and estranged mother.

A chaebol-born pharmacist struggling with severe drug addiction; maintains sobriety cold-turkey through sheer willpower and cellmate support, but suffers a tragic, devastating relapse immediately upon release.

To clear his military record, regain his honor, and hold the true culprit accountable.

Framed for the brutal beating death of an army subordinate; initially hostile, volatile, and defensive, he softens under the room's warmth and relentlessly pursues judicial exoneration alongside his brother.