Kim Tae-Hyun is a brilliant surgeon forced into the shadows by crippling debt and his sister’s desperate need for costly medical care. To survive, he takes on a secret identity, ”Yong-Pal,” offering his surgical skills to the underworld’s elite: gangsters, corrupt tycoons, and those who demand discreet treatment. But when Tae-Hyun is called to a risky “house call,” he rescues Han Yeo-Jin, a chaebol heiress trapped in a medically induced coma for three years, setting off a dangerous chain of events. Now caught between ruthless criminals, power-hungry hospital elites, and Yeo-Jin’s fight to reclaim her life, Tae-Hyun must navigate a deadly game where every move could cost him everything.