Kang Yi-heon

A fantasy medical drama about a high-ranking grim reaper named Kkok Du, who is the only being to exist in the underworld. Every 99 years, the cold and cruel Kkok Du must take a break from his job in the underworld and spend 49 days in the mortal realm—and this time, he winds up inhabiting the body of the human Do Jin Woo. While living as Do Jin Woo, he meets Han Gye Jeol, a female doctor who has the mysterious ability to order Kkok Du around.

Woo Tae Suk is an experienced and well-established detective with a long professional career, but in spite of everything he is a lonely and bitter human being. It all has to do with him only focusing on solving cases, while his actions are completely controversial because it crosses the line between good and evil. Woo Tae Suk crosses paths with a psychopath, but he cannot arrest her because of lack of evidence. The woman eventually decides to help Woo Tae Suk solve other cases.