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.

The drama draws a love story between two co-workers at an insurance company, with Kim playing the company’s whip-smart lawyer. Because he carries the hurt of having been abandoned by his birth mother, he doesn’t easily open his heart to others. The female lead is a 25-year-old employee of the company who becomes responsible for her five younger adopted siblings after her parents meet with sudden deaths.

Lee Kang Hyun is a manager at a company that sets up people who have been divorced with dates. She meets a divorce attorney, Park Hyun Soo, and they begin a relationship with each other.

A comedy romance drama about potential son in-laws who come finding their way to the doorsteps of their future wives because of fate. Jo Gi Dong is a guy who causes some chaotic situations when he aims to become the son in-law of a rich man portrayed by Joo Hyun. Han Mi Soo is a rich girl who falls for Gi Dong. Kim Seung Soo plays Mi Soo's first love in college.

Na hana loves money more than anything. she left her home town for seoul. She decided that the only way she could be with money is to marry a rich man who will die soon. She soon meets yoon ho sang, a young man who is a poor, troublemaker, and also loves money, but is in diguise of a very rich man who died. these two meet and soon love sparks but yoon ho sang has a serious cancer problem which he first lied to a man who he owes money to.