Silver Bullet Exorcist is a Manga/Manhwa/Manhua in english language, HISTORICAL series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

In a chaotic Joseon dynasty with vampires, ghosts, and shamans, Park Moon-soo, who calls himself a dark-speaker, destroys a corrupted official. In order to order to subdue the dark master Park Moon-soo, who is trying to revive the vampire king, the court dispatches Anson, a military officer who has just passed the exam, to find Hong Kil-dong, an outlaw who is good at swordsmanship and martial arts and dispatches him to Taebaek Mountain.