In Xu Xiangyang's daily life, he almost never cursed.
He had always been a good student, the kind with both excellent grades and behavior, even during the time after he transferred schools when his grades didn't keep up. He always followed the rules of being a minor and a student, never needing adults to worry about him.
In short, he was such a good kid that he would feel embarrassed if he accidentally blurted out an expletive like "fuck" when emotionally agitated in private—so much so that he'd be even less likely to say anything of the sort in public.
Perhaps it was also the influence of his surroundings. At school, those who carelessly spouted foul language were usually bad eggs who had given up on learning, and he always kept his distance from such students.
However, this moment was different.
When he swore, Xu Xiangyang not only did not feel guilty, but he also experienced a refreshing sense of catharsis, as if venting out all the frustrations in his heart at once.