The one with the enigma thing? & the mc had white hair? I think ik what you're talking about
What’s the name????
https://www.mangago.me/read-manga/crimson_ocean/
Dont know if u still looking for this but, is it this one????
Crimson ocean YEAHHHHH
Crimson ocean YEAHHHHH ε=ε=(ノ≧∇≦)ノ
Yes, Crimson Ocean, thank you
(灬º‿º灬)♡
The side story reminds me of that one of a guy that got into a planet with giant volcanic beings who wanted humans to reproduce. I don't remember the name now but yeah, that one was interesting.