@Legion_01 I will agree with you that there is love and friendship in this series, but nah, not dumb. It's not lost if his score didn't reach 0. You're thinking of SAO where his score actually reached 0, he receives a message telling him he's dead and THEN he goes against the system and kills the boss. If it were that then 100% agree it would be an atrocious shounen.
As for being slow, I think you just don't realize what makes a series entertaining in the first place. You're looking for conflict => resolution. There has been conflict throughout the first chapters and their resolution, just because the invasion didn't start on chapter 4 doesn't mean the story is slow
There is also a lot of build up for the next arc which raises expectations (the classic: omg what will happen next? feeling), but if you just binge read it, maybe you won't pay attention to it because you directly get the resolution and barely any expectations, but for me who's been working each chapter for weeks on end, I can tell you it was extremely satisfying.
Feel free to stop reading if it's not your style of series, but as far as I'm concerned, as long as there is internal logic in a story and there is conflict amongst the characters (which there is), it will never be boring!
I think you went in this looking for something specific and when you didn't find it, you were enraged and therefore nothing the author would have done could have satisfied you, might as well discard the whole story and start anew. I hope you find what you want somewhere, but it most likely won't be in this manhwa. Thank you for reading though