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This page is about the history of the World which was divided into two by the Promise. One for the Human World and Demon World.

Sonju said that back then Demons hunted Humans for food but the Humans fought back. After several years they made a Promise.

In Shelter B06-32, the Grace Field House escapees look through the books and learned about the Identifiers. The books are mostly dated 2015. chapter 56