Secret Investigation Record is based on cases detailed in the Annals of Joseon History with a bizarre twist; these incidents incorporate mysterious, supernatural elements that cannot be explained through science. Kim Hyung Do is an inspector of the state whose single-minded focus on his investigations into administrative misdeeds bring him into direct contact with these strange mysteries. Heo Yoon Yi is a government employee who aids him and attempts to understand these scientific impossibilities with an open mind, in contrast to his cynicism.
Back then when they dared to try something different to varying degrees of success. It's not fair to compare this to The X-Files, they have nothing in common other than sharing a similar genre. Anyway, the drama was a mixed bag, some cases were better and more interesting than others. The main story that was progressing in the background wasn't well fleshed out to tie everything together and the ending was just okay. The performance of the cast was alright, nothing major but some scenes lacked the effort.