Comprehensive comic: Beginning of God on Earth

As the name suggests, he is the "Cosmos Demon", one of Kwanghee's demon wives.

The ability is to inject all the knowledge in the universe into the consciousness of others, and the person who acquires this knowledge will not be able to think about anything but "Halloween".

Usually only saying "Halloween" seems to be the result of being influenced by one's own abilities, and he can speak normally in his own conscious world.