This is where the free chapters are!:
https://www.webtoons.com/en/challenge/high-school-boys-trapped-in-a-fantasy-world/list?title_no=487522
There too:
https://theyaoiarmy.com/
Where you can support them!
I'll complain here because i don't want to bother the author there x")
But i HATE IT when you got two/tree planche per chapter, i mean i'd rather have 1 long chapter every two weeks (or more) rather than little by little but every weeks^^"
Anyway, the story is really good, that's why it is frustrating!!
HighSchool boys trapped in a fantasy world