The Demon Prince's Hunt

Adrian's master, Victoria, drives a blade through his heart while he is in the middle of killing his junior brother Sebastian, who has gone over to the demons. Adrian was the senior disciple of the Crimson Dawn Sect, the keeper of the tower that seals demons, and the one who led the other disciples in clearing them out of the Forbidden Grounds. That was the fight that ended with him dead. He comes back with everything he remembers. His first decision is to leave the sect and keep his head down somewhere alone. Before he can, his master's manner toward him changes and he is shut into the Forbidden Grounds. Inside, he wakes a system that makes him stronger every day he signs in. The people who brought about his death are living in glory and keeping the truth hidden. Sebastian is the Demon Prince and set the whole thing up to get hold of Adrian's Divine Bone. He tries one method after another to force Adrian out of the grounds, and each attempt shows more of what he is. The sect begins to notice. The gate of the Forbidden Grounds is opened for the first time in three thousand years.