The Slingshot follows the life of Kim Shin, a man whose life is shattered when his brother commits suicide and his family is ruined by the ruthless corporate conglomerate, Dae-myung Group. After being framed for a crime he did not commit and sent to prison, Kim Shin transforms from an innocent, optimistic young man into a cold, calculating strategist determined to exact revenge against the powerful forces that destroyed his life. Upon his release, he enters the cutthroat world of high-stakes finance and corporate warfare. He forms an unlikely alliance with a brilliant but eccentric genius, Seo Kyung-chul, and a mysterious woman, Seo Kyung-ah, who is tied to the man he hates most. Together, they engage in a dangerous game of cat-and-mouse, using intellect, manipulation, and sheer willpower to dismantle the corrupt empire that sits at the top of the social hierarchy.