Nothing much to say about the novel, except that it's amaizing.
Writing Quality: 5/5. English is my second language but there are no big mistakes so far, so it's good enough for me.
Stability of Updates: 5/5. 2 or sometimes even 3 chapters per day is phenomenal.
Story Development: So far, so good. There is goal in mind, there is purpose and then there's PLOT, everything is balanced and there are no filler or info-dump chapters which is always good.
Character Design: The MC was immortal for a long time, so he isn't inexperienced, dumb or naive. He knows what to do and is ready to do it. There is also character progression with interesting touch where he learns more about the mortal life, that changes his views about the world and the lower world cultivators. Other characters are also interesting and different.
World Background: Interesting in the sense of future development. So far we know about a lot of the world but haven't explored it yet. So far we're still in the lower world so there is still a long way to go, but there are no complaints here since it's solid enough.