Doctor on the Edge follows Do Ji Ui, a talented plastic surgeon who fulfills his mandatory military service as a public health doctor rather than serving in the armed forces. Assigned to Pyeondong-do, a remote and isolated island far from the mainland, Ji Ui expects a quiet year of medical service before returning to his normal life.
However, from the moment he arrives, he realizes that something is deeply wrong. The island is plagued by strange incidents, unsettling secrets, and a growing sense of danger that makes every day a struggle for survival. As mysterious events begin to unfold around him, Ji Ui finds himself caught between his duty as a doctor and the harsh realities of life on an island that few are willing to call home.
Facing difficult patients, unexpected challenges, and a community hiding more than it reveals, Ji Ui must rely on his intelligence, resilience, and medical skills to endure his year-long assignment. But as the island's dark truths come to light, he begins to question whether he will be able to leave Pyeondong-do unscathed.
Blending medical drama, mystery, and suspense, Doctor on the Edge tells the story of a young doctor pushed to his limits as he fights to survive in one of the most unforgiving places imaginable.