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Regarding the art style changes, let's not forget this artist has had to change the way she drew the characters, Yujin especially after (what seem like unfounded) claims of plagiarism by another author. While Yangma did dispute the claims - none of which were proven legally - she still chose to shift her drawing in hopes of appeasing them and stopping constant letters and requests from the other artist.
So, we don't know what might be going on still behind the scenes, nor the length at which she's been affected by the situation. She could be still figuring out the look she wants to achieve, or it could be a temporary result for other reasons.
Whatever the case may be, I hope that if we have comments about the art (pos or neg), it could be done mindfully and not accompanied by insults toward the artist.