Elyon
Celine already gave a bad impression. No matter how good she became later, she will not change the way we look at her. Meaning we don't like her.
You are comparing oranges to apple. Celine is a a teacher, a master to the MC. Why are you romanticizing slavery? Normally, she could say that she can beat him with dark magic until MC is immune to it. And hey, don't even bother to say that it is because of some rare treasures that it should be the MCs fault, well part of it but making him a slave is so wrong in so many levels. No matter the perspective, no matter how good she is later, she will be, to me hated, like how I hate Rachel in Tower of God. Rachel is a b*tch so is Celine. Period. MC is naive and a fool like the MC in Tower of God. But I'll keep reading from here to see where this is going. Personally, I like ruthless MC but I understand MC is still young.
PONEYLACH:na i just find funny people dislike her , but dont dislike other characters that do the exact same thing , so i dont hate her i just found it funny that everyone does ahahaha. and kink shaming in webnovel FeelsWeirdMan
Didn't he have extra millennial beast core? Why did he not use it to level up his own level? So he can use extra stat to endurance? Feels like mc is just making his life harder when there's a shortcut, there's no side effects so why don't he use it? If there's one, then his system is mediocre at best, But the title is Reincarnated with the STRONGEST SYSTEM" so there's should be no disadvantage;