Scholar Who Walks the Night Genre Historical Fantasy Romance Based on Scholar Who Walks the Night by Jo Joo-hee and Han Seung-hee Written by Jang Hyun-joo Directed by Lee Sung-joon Starring Lee Joon-gi Lee Yu-bi Shim Chang-min Kim So-eun Lee Soo-hyuk Country of origin South Korea Original language(s) Korean No. of episodes 20 Production Running time 60 minutes Production company(s) Content K Release Original network Munhwa Broadcasting Corporation Original release July 8 (2015-07-08) – September 10, 2015 (2015-09-10) External links Website