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Manga About a boy who was transported into another world and try’s to survive there but died and then is returned back in time to when he first was transported there when he was a kid.

Meets somone his age who he remembers will become the strongest in the world and becomes friends and promises to meet back up in 10 years after he gets strong so they can fight, it is still an on going one so I’m not sure what happened after that but I know he keeps training on a mountain for a few years and his training involves getting his sences taken away in order to train there on the mountain and makes friends with the others training there who help him get stronger

The world has people from many worlds and are all brought together from murim as well as other types of worlds I belive

Not sure if any of that helps but I’m really trying to find it, I really enjoyed it but lost the link to it 🤣

Sorry if anything is wrong first time posting here! 😀

This is definitely Worthless Regression