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What if Guwon vomits after the kiss because he thinks it's the right thing to do? Notice that after the first kiss, Teacher ran away, and after the second, he ran to the bathroom. Maybe Guwon thinks it's normal to vomit after a kiss? Guwon didn't know what exactly Teacher does after he kisses, and he could hear a sound and "something wet" when Teacher went to the bathroom to masturbate, and bathroom + wet sound = vomit?