Scholar Who Walks at Night (Hangul: 밤을 걷는 선비; RR: Bameul Geotneun Seonbi) is a 2015 South Korean television seriesbased on the manhwa of the same name written by Jo Joo-hee and illustrated by Han Seung-hee. Starring Lee Joon-gi, Shim Chang-min, Lee Soo-hyuk, Lee Yu-bi and Kim So-eun, it aired on MBC from July 8 to September 10, 2015 on Wednesdays and Thursdays at 21:55 for 20 episodes
Set in an alternate Joseon dynasty, Jo Yang-sun is the daughter of a nobleman whose family loses everything when her father is framed for treason. To make ends meet, Yang-sun begins cross-dressing as a male bookseller, and meets the handsome and mysterious scholar Kim Sung-yeol, who works at the Hongmungwan. Sung-yeol is a vampire, and he continues to be haunted by the long-ago death of his first love Lee Myung-hee, especially when he meets Myung-hee’s present-day doppelgänger Choi Hye-ryung, an aloof nobleman’s daughter. Meanwhile, the evil vampire, Gwi, resides in the royal palace and uses his powers and political machinations to prevent the Crown Prince from ascending to the throne.