He spent 56,000 hours in a cell, increasing his IQ in baduk for his revenge

Professional baduk player Tae-seok loses a high-stakes game to infamous underground gambler Sal-soo, and ends up framed for the murder of his own brother and locked up in prison. He vows revenge and trains ferociously. After serving his seven-year sentence, he gets in touch with his brother's former associate "Tricks," hermit and blind master player "The Lord," and skillful junkyard owner Mok-su, "the Carpenter"; together, they begin formulating a plan to get back at Sal-soo and his men. Tae-seok slowly penetrates Sal-soo's inner circle and his gambling joint, and eliminates Sal-soo's men one by one.