Strong Gale, Mad Dragon

When Kang In-Young is betrayed and framed for murder, he is sent to prison. There he meets an old man who used to be a petty thief. He steals a secret martial art from JeonJin sect and decides to enter the prison and spend 30 years honing the secret martial skills. Tragically, after catching a plague-like disease, he decides to give Kang the secret art in his will. After 10 years of training, Kang fully masters the art and leaves prison.