The Knight Master is one of the founders of Grand Chase, who recruits Elesis, Lire, and Arme to their guild. She also files mission reports as well and is supposingly the "Quest Helper".
Knight Master is actually female, despite her male looks.
The Knight Master is only seen in dialogue of Trial Tower, Outer Wall of Serdin, Kerrie Beach, Orc Temple, and in Gorgos' Dungeon. She reports mission requests to the trio, until Gorgos' Dungeon who sends them off to find Kaze'aze and wishes them luck.
Speaking to Lass, she does not judge over his dark cloud but gives him a second chance to start over again.
In the Grand Chase Comic Guide, the Knight Master helps a beginner named Aimee to start the game.