The professor teaching them management was an old and strict one. He had asked parents to come to the university if anyone spoke during class and report it to the administration office, where they had to write a self-critique. At times, they doubted if they were in a university or an elementary school.
After all, no university was this torturous.
Many had protested once before, who knew the old professor didn't give up on them. Instead, he provoked their rebelliousness and ignited his own competitiveness. He resigned from teaching other classes' management courses and chose to teach only Class 7.
The old professor even issued a declaration of war to the administration office, saying that if he didn't teach Class 7 well, he'd quit. No one could withstand that provocation.
It wasn't that they were afraid to challenge the old professor, but it was more of a hassle. No one would want to deal with parents and write self-critiques all day long.