Although Qiao Yu has never experienced what Senior Brother Chen is going through, he can understand Senior Brother Chen's feelings.
It's probably like being treated as a punching bag at his most insecure moments.
In fact, Qiao Yu has also been used as a punching bag, but his temperament is different from Senior Brother Chen's. If he has a grudge, he'll smile and pretend he doesn't care, then turn around and think of ways to make himself feel better.
Compromising himself to let others vent their emotions is certainly not something that works for Qiao Yu. So wherever he goes, he first makes sure to get along well with the majority of people.
As for Chen Zhuoyang...
It's nothing more than cooperating with the young junior brother. Even if it seems a bit sycophantic, what bad intentions could a sixteen-year-old kid have?
He just wants to have the authority of being responsible like an adult.