Too many terrible cliches that turn any manwha no matter how good the art or world building into lazy slop.
Seriously, why did the MC stick with the bounty hunters he should have left and forgotten about and why does the MC end up getting involved with conflicts and helping people without a reasonable explanation. Some girl sneaks onto the same ship and he just decides to conflict with whoever’s against her without knowing anything. Common case of author having zero imagination and having people tag along with MC for no reason and the MC conflicting with others out of nowhere.
He also has no emotion or logic, so if someone tries to kill him he just does the bare minimum and defends himself and acts like there was some natural disaster and ignores the fact the person wants him dead.
He also avoids a fight with a supreme master because he’s afraid of dying, but later he easily defeats a supreme master with a few basic punches- if you’ve read enough of these slop manwha you can guess that in the first case the supreme master was female.
Wanna say that I'm with you about some conflicts being random, the thing about mount hua leader's daughter seemed forced, didn't understand him helping her so much, after that all the other conflicts seemed to be sometimes to help the crew, other because he seemed to value life of other people a lot maybe because of his enlightenment, that for me is also the reason he avoid killing, we saw in a flashback that he killed a lot of people, but was not happy of this way of living.
Talking about the enlightenment, it's obvious that the reason he went from needing to risk his life to kill a supreme master to beating one with no effort is because of the "understand life and death" thing, he survived a bomb designed to destroy planets, also the sword matron looked stronger than the fist emperor, she threatened to kill him if he dared to go for the MC.
Lastly about him leaving the group, its true that there isn't any big reason to leave them, though they were the first people he so after 2 thousand years, but it more like why should he leave them? His dream was achieved, he is not the heavenly demon of his time, he doesn't know anything about this new world, he just travels with them to eat and see the universe.