
I think because Arhad is around, we're seeing a side of her that wasn't portrayed in the earlier chapters. I have a feeling that if she remained cold hearted it would have no some people too.

This. People seem to not notice that that change in art style coincided with Arhad’s appearance and with Arhad’s appearance there’s a visible change in Ianna too but people are more focused on the art style that is why when they noticed that Ianna has “changed” they attributed it to the art style.
I’ve read and reread this webtoon so I’m quite familiar with Ianna’s views on Arhad plus, she wasn’t a tsundere so it was fun seeing her chasing Arhad around
⁄(⁄ ⁄·⁄ω⁄·⁄ ⁄)⁄ .That was sooo in line with her character that I was disappointed she didn’t go all out and professed to be Arhad’s knight. Then again, that was also sooo her to be calculating enough to know that she’ll have to do it step by step.ヾ(☆▽☆)
I can't EVEN. I AM DECEASED. DEAD GONE. Haebom is the kind of cute smol Bean bf I want. Taesung you lucky bastard.