I don't agree. That panel you're talking about: it's obvious the guns are 3D art while the characters are 2D art. So obviously the creator kinda fumbled to connect these two objects seamlessly with each other. Maybe the art style isn't your cup of tea, that's totally fine. But to simply call it AI art isn't the right call. This Manhwa has a unique art style and a heartwrenching story, so you'll miss out. But obviously I can't force you to read it if you can't get warm with the art style^^

This is so obviously AI art:( or at least ai assisted/ enhanced. It’s definitely not just the “art style” because if you look closely on the second panel in the first chap, the hand and gun on the person to the left is blending together(obvious sign of ai), if you look close enough at the hair there’s small inconsistencies in the lines. The cover art is also clearly ai because of the gloves/hands so I don’t doubt that the manhwa itself uses ai
I did drop it in the middle of the first chapter so I don’t have an other examples but I think it’s still clear enough that it’s ai