I will preface by saying that the prior artist can rot. It's good they got replave and I am purely going to talk abt the art style seperated from the artist.
I think the reason a lot of people heavily dislike the art style is because it emphasizes much more on trying to look aesthetically pleasing just like almost every other BL. And there is nothing wrong with this type of style, it functions, it looks fine but what it misses is it's own identity, it's own style. And this is where the prior art style came in because it was oozing with it's own style and did something more unique than a lot of other BL manhwas. (Which isn't to say there isn't a good amount of BL manhwa with an unique style but in comparision to the more aesthetic ones they r rlly in the minority)
Emotions, movements, etc. were composited in a very different and more interesting way than you'd see in a usual more "aesthetic" BL.
While I don't hate this new art style, I think it's weaker in terms in illustrating and setting apart the story, in comparision to the old one.
I think the new art doesn't deserve hate but I get why some people are frustrated over this change.
I am curious about all of your opinions though :3