"Ox-Head, I mean the Ox-Head from Ox-Head and Horse-Face!" Ox-Head tried to explain his identity.
Souls and spirits construct the Great Reincarnation in the void, and various worlds of all sizes possess similar reincarnation systems, with the underworld being remarkably uniform.
Standard elements like Ox-Head and Horse-Face, Judge and Wuchang, are all reflections of the Great Reincarnation. Even in worlds with different systems, similar job titles exist.
Chapter 305