In a quiet suburb, an ordinary guy named Stan faces a big problem: jail. This typical businessman, full of insecurities and lacking muscle, discovers that he will soon be imprisoned for real estate fraud. Terrified of life behind bars and the possibility of becoming a victim of feared prison bullying, he decides to seek help. His savior is a strange martial arts teacher who teaches him self-defense techniques that not only transform his body but also his mindset.
As Stan gets ready to face an entire population of prisoners, he evolves from a vulnerable being into an imposing figure. With each lesson, he gains confidence and becomes an expert in martial arts, ready to strike hard. However, despite his newfound power, not everything is so simple: inside prison, he faces rivals who challenge his new image and his own fears.
Life in prison turns into a whirlwind of comedic entanglements and surprising twists as Stan tries to stay on his feet and not succumb to the culture of "the strongest." What begins as a struggle for survival culminates in a lesson of self-confidence and genuine friendship. With humor and action, the plot reveals that sometimes the true challenge is not fighting against others, but fighting against oneself and emerging stronger.