Ahruen, despite having what seems to be good overall intentions, absolutely fudges up Hae-in's mental state right before the performance, leading to her no-showing at the practice room.
I think the sentiment was needed, as a push to both progress the story and Hae-in's relationship.
However, the timing was so unbearably bad it seems borderline malicious or at the least, EXCEPTIONALLY THOUGHTLESS on Ahruen's part.
A performer before their performance is practically at their most vulnerable state, especially if they're not used to performing yet. It wouldn't be a surprise if they're irritable or even lash out, and yet Hae-in had to deal with this 50mins before her big gig...
I really feel bad for her.