In high school, my classmates were very close. Everyone is simple. Most of them play together because they really like playing with each other. However, the relationship between college students will be more complicated, such as joining student unions and clubs. Some people will choose who to associate with in order to have a better resume or a wider network in the future. Most high school students come from the same province or even the same city, so their living habits and customs are similar, but college students come from all corners of the country, and their thoughts, living habits and eating tastes will be different, which will lead to many incomprehensible contradictions, such as the dispute between the North and the South; There are occasional contradictions among high school students, but they will soon laugh it off because of some class group activities or trivial things in study and life. However, in college, students don't spend much time together because of different classes and participating in activities such as clubs and student unions, and their relationship is not as close as that in high school. Therefore, contradictions will only accumulate and then erupt, which may lead to incidents such as roommate poisoning.