Under Doctor is a dark and intense medical thriller set in a hidden underground world where illegal surgeries and criminal networks operate beyond the law, following a mysterious doctor who treats dangerous patients in secrecy, risking his life while navigating a system built on corruption and survival.

As the story unfolds, it delivers high-stakes tension, brutal medical procedures, and psychological conflict, evolving into a gripping narrative filled with moral dilemmas, hidden truths, and escalating danger, where every decision blurs the line between saving lives and enabling destruction. Blending crime, drama, and psychological intensity, the series explores themes of identity, power, and survival, establishing itself as a dark, compelling story, also known as Under Doctor manga, underground surgery thriller, illegal operation series, and psychological medical drama.