I agree with you meep, this story is way better than Lucky Paradise in terms of plot, but the art is worse.
And about them being brothers that's why they look alike, it's not just the brothers, it's everyone looking the same, with just different hair color, they don't have much character desing details.
It's just my opinion, I'm not trying to offend anyone.
You’re completely right, I love this story a lot but I’ve said the same about the art before. The quality dropped, no life in backgrounds anymore, characters look so alike it gets confusing. Woojin was so detailed and expressive in Lucky Paradise but now there’s barely any expressions, the most we’ve had was in this chapter.
People are so weird and don’t read to comprehend. You literally only mentioned the art, you never said the story was bad.

The art quality droped so much compared to Lucky paradise. Almost all the background pannels are white and the characters look the same, sometimes it's hard to tell who is who...