In modern society, ignored persons suffer. They're regularly killed in industrial accidents. Most calamities might be avoided with some planning. Some companies or public organizations don't prepare for accidents due to cost. So happen industrial accidents. In Doctor Detective, doctors examine industrial accident victims and investigate the incidents' causes. Joong Eun, a skilled doctor, joins an undiagnosed disease center (UDC) while having personal problems. She investigates her patients' industrial-accident-caused ailments and reveals the reality hidden by the powerful.