Also known as "Joseon Detective", "Detective K : Secret Of Virtuous Widow"
Detective K tells about the adventures of Joseon's top detective (Kim Myeong-min) as he investigates, as ordered by the King, a series of mysterious murders that is plaguing the country. During his secret mission, he meets Han Seo Pil (Oh Dal-soo) who eventually becomes his sidekick, and Han Gaek Ju (Han Ji-min), an influential business woman who is a key figure in the case. As they dig deeper into the mystery, they uncover disturbing secrets that link the murders to a massive conspiracy that will shake the whole nation of Joseon.
Based on writer Kim Tak-hwan's detective novel about a detective who chases a case about a woman who has committed suicide. It is directed by Kim Seok-yoon, who directed "Old Miss Diary - Drama" and "Old Miss Diary - Movie".