Read The Demonic Cult Instructor Returns manhwa in English where martial artists battle martial arts rivals. The world faces an incoming demon invasion that previously destroyed humanity. Protagonist Bigang Sa retains his centuries of demon warrior training from his past life. He uses the unique Murim world system to cultivate martial arts power. His goal is creating a new class of powerful fighters before enemies strike. A hidden truth about the future disaster drives his daily preparations. Bigang Sa is training vulnerable disciples while preparing for the brutal war.