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Huh??? this the first time I hear about that????I ALSO WANNA KNOW

I remember hearing about this too but like two years ago. I know Neolithic girl and jungle juice are both part of the same universe (these are webtoon). You could probably look this up on Reddit.

I just checked and someone explains this in the comment section on the first episode on Neolithic girl.

The PTJ universe are all of the webtoon he made/co-made, in it you'll find : Lookism (The most Well-known), How to Fight, Questism, My life as a loser (my fav), Manager Kim and also lesser known webtoon like Loser coin.

Then there is the blue string, and superstring, they're called like that because all of the webtoons in these universes are owned by YLAB, a webtoon studio.

Iirc they only overlap because Hanlim appears in Hanlim Gym (which is a superstring universe webtoon, but also in the Blue string) but also in True Education (which is in Blue String univ)

Amongst the most well-known webtoon in Blue String you'll find : Hanlim Gym, Study Group, To not Die and True Education.

And in Superstring ; Terror Man, Jungle Juice.

There's a lot more webtoons, but if u really want to know them all, just do a quick research on google, you should find the wiki page easily

I don't believe there's a specific order, although they are in the same universe they usually just reference each other. For exemple, the MC in To not die gets inspired by a secondary character in True Education. Just read what seems interesting to you !