-how the others would go for the last shot to kill steal just for points ?

It's interesting to see that there is 3 of him in this world and all of them walks a different path but they are kinda helping eachother in the shadows. I am looking forward what happened to his companions and what the hybrid (half mutant/half human) him will do.

All of this changed dramatically and exponentially when he received a notebook from a demon.

Unicorns.

He is the only one to have succeeded in the 10th body upgrade, which deletes your characters if it fails, where all others rankers stopped at 9th. And he is also the only one to have succeeded in remodeling his BattleSuit with 10 combinations, where there again, all the others rankers only did 9 combinations.

Future earth people had to leave earth to go through space and wants to colonize some new planet with strong monsters. But they can't decide how to fight those monsters, so they start an experiment through Life Mission. I won't say more but that's the idea.

Funny thing, at one point, a ranker nicknamed "Invisible" join their team. Well that's about the impact he had on the story, nothing, he was invisible through all the chapters for me.

Then, after a while, the author introduce to us to some Lifers who decided to specialize in the Medic role, they prioritize buying medic tools to heal injuries of other Lifers during missions. That sounds good and useful right ? I mean, they could save life or restore battle force for case where people gets injured during the mission without having to wait the end of it, right ? Wrong. They are just deadweight for their team, 99% of the time. Let's be honest, through the whole story, the role of Medic was used 3-4 whole times. And 2 times, the mission was actually already over, so they just saved a bit of points when their stuff costs as much as weapons to buy.
That would be ok if they were just fighter that also bought the medical stuff, but no, they are people that just heals and have a very low fire power. I could still accept it if it was only that... But then when the characters start to specialize / customize their battlesuit, the author actually say that Medics specialize it for healing ? Like, seriously ? It's called a "BattleSuit", not a "HealingSuit"... And there is no explanation of the usefulness of it compared to normal healing stuff... Nobody would do that in real life I think.

Obviously, our MC has such a Medic in his team, which makes even less sense as they are a low member team with very high fighting power for each member in theory, and because they are one of the best team around, they don't really get hurt so much. What's even funny, is that other teams take as much as 10% of the whole raids in the final missions.

that they gain 10% of the points their victims have currently on them. Yes currently, so if I spent 10 millions points in total for my stuff and have 100 points on me and someone kills me, they will earn 10 points. Could they loot my stuff ? Nope, hardly, most of it will be inside my locked personal bag, the only thing they could loot would be my armor and weapon that would probably be destroyed after we fought anyway.

After Jun Sung had his talk with Zephyrus, this last one left the mission to return to reality, while Jun Sung stay around a little longer for no reason, and that's when the chapter start. It starts with the birth of a powerful monster in the zone around where they were hunting monsters. The monster being born is actually the king of all the Level 1 that they have been killing and all the others level 3-5 monsters around the scene where he is being born (Level 3 are called Evil Blood-Suckers while level 5 are called Demon Blood-Suckers for this species of mutants). This scene is here just to show that linked-missions are possible, i.e some missions give informations about new ones or can unlock new ones, and this one gave informations about a possible future level A mission.