Sib Nuea Luang, also known as 'Doctor Detective', follows the story of Khun Khao, a brilliant and dedicated epidemiologist working for the Ministry of Public Health. When a mysterious and lethal disease begins to spread, threatening the lives of many, Khun Khao is tasked with investigating the source. However, he soon discovers that the outbreak is not merely a natural occurrence but is linked to a sinister conspiracy involving powerful figures who are willing to sacrifice lives for profit. To uncover the truth, Khun Khao must team up with Janejira, a sharp-witted and determined journalist who is also searching for answers regarding her own past. As they navigate the dangerous world of medical corruption and corporate greed, the two must rely on their combined expertise and courage to expose the culprits before the virus claims more victims. Their journey is fraught with peril, testing their resolve and deepening their bond as they fight for justice in a race against time.