Guardian: The Lonely and Great God (Korean: 쓸쓸하고 찬란하神 – 도깨비) is a South Korean television series starring Gong Yoo in the title role, alongside Kim Go-eun, Lee Dong-wook, Yoo In-na, and Yook Sung-jae. Written by Kim Eun-sook, the series aired on TVN from December 2, 2016, to January 21, 2017.