QUICK ANNOUNCEMENT! This Wiki site is made only to collect information about the manhwa A Modern Man Got Transmigrated into the Murim World, and does not include heavy spoilers from the novel, there are exceptions.
Jo Yu (조유), the Ancestral Master of the Secret Society, who lived in the Central Plains 500+ years ago, and he is an Ancestor of the Jo Family, who is living as a spirit in the Uicheon Crimson Jade with the other ancestors.