Witch Hunter

, is a Korean manhwa series by CHO Jung-man. It has been serialized by Daiwon in Super Champ since 2006 and collected in fourteen bound volumes as of November 2012. The French version has also collected 14 volumes.

Plot
Witches suddenly declare war against humans, causing the world to fall apart. In the space of ten years, two-thirds of the world fell under their rule. Surviving countries united and gathered people with the power to combat the witches. These individuals are called Witch Hunters.

Tasha Godspell, a Witch Hunter, nicknamed "The Magic Marksman" along with his "Jack-o'-lantern"-looking Supporter hunts witches but cannot bring himself to hate them. His main purpose is to find his master and his father's killer --- his younger sister who transcended into a witch and turned her back.

Official

 * Witch Hunter Official Korean Blog

Other Sources
Witch Hunter Wikipedia Page