When freshman Zhou Xiaoan puts on a ring of unknown origin, a terrifying demon leaps out of his mouth and his life changes forever.

When Freshman Zhou Xiaoan puts on a ring of unclear origin, a terrifying devil leaps from his mouth and his life is changed forever. Shocking historical secrets are slowly revealed - a Blood Devil calling itself King Zhou of Shang, a race of heart-eating zombies; a dubious group of Taoist Priests that fight against them; mysterious beings of the supernatural world who can blend into human society.—myanimelist