Responses
According to some other commenter I think they changed artists and the current one is trying to keep the style from S1. Either way, especially compared to other art style changes that happen between seasons, this one's still pretty good.
I feel like after season 2, the art style kinda changed? It was a subtle change but as someone who was soooo invested to this story, I feel like there were changes. I think the eyes got bigger, the lines got softer, and Seojun's hair was kinda different (longer?) from the previous chapter (season 2 finale).