Cho Sang-woo is a pivotal character in the series 'Ojing-eo Geim' (Squid Game). He is portrayed as a highly intelligent and ambitious individual who was once a successful investment banker. Despite his promising career, Sang-woo finds himself in deep financial trouble due to risky investments and mismanagement, leading him to join the deadly game in hopes of winning the prize money. Throughout the series, his moral compass is tested, revealing both his strategic mind and the lengths he will go to survive. His complex character adds depth and tension to the storyline.