Jang Deok-su is a ruthless gangster who entered the game to settle massive gambling debts, having an acrimonious past with Kang Sae-byeok and fallen out of favor with his crime boss. Deok-su is a violent, sadistic, and condescending man. He shows little to no remorse or compassion as he progress through the Games’ rounds, assaulting and sometimes killing other contestants not only to gain a strategic advantage, but also out of personal spite. Secretly a coward inside. Slight pervert and sexist.