
(Nerdy Artist Yap Incoming)
This actually happens a lot! As an artist, who hasn't worked on a long term comic but has some knowledge, the first part of the story is made with a big amount of time to start the process, some take a year or so before the release of a comic. There's more time to work and usually you want to get readers hooked so more detailed art is the go to.
After a while, while it does seem like art is " downgrading " it's simply because they are on a schedule. With deadlines come needed shortcuts so their simpler version of their style is better. Kinda like how an animated episode can go from simple animation to a scene where they clearly put all the budget into cause it's a big important scene. (๑•ㅂ•)و✧
Did the artist change between season 1 and the rest of the manhwa? The newer art looks more generic and lacks the visual depth and detail the old art has.