To be fair Mirae was in the wrong here, even if the other girl was setting her up. You never ever hand someone a hot object in the lab without looking and with only one hand. That's just asking for trouble, someone could've actually gotten hurt. It's so stupid of the main character when just a few minutes ago she was reprimanded for not being careful around a hotplate, maybe she isn't cut out be a chemist.
I mean she could seriously die if she was this careless around actual chemicals while making perfume compounds.