@lol
Novel spoilers... (dont read if you dont wanna be spoiled of course)
Spoiler!
The world is divided in many parallel worlds, (fellow novel readers correct me if I'm wrong, it's been a long time), Kang Han Soo is currently in the Elementary Level of the Fantasia Teaching System (The system and teaching staff which make heroes as explained before). These grades vary from Elementary > Secondary > High. Demon King Pedonar is actually the G** of Space and the First Demon is imprisoned on Fantasia and not a summoned person.
Mr deez dont hurtt mee Mr deez Mr deeeezzzz Boiiiii Mr deez odin din din No tunging tunging Ahhhhhhhhhhh