Bruh I'm starting to be a headache.
I don't care if he plans to expose them in one big scheme now. The fact that there are situations where he can step in and possibly stop or pretend to stop the bullying and he still doesn't makes me believe he actually wants the daughter to suffer. Even a few chapters ago when the girls were by the gym, he was around the corner just listening not even helping or leaving, just listening to her get bullied.
Tbh, it just seems like he wants the worse to happen to her so he can throw it back at his bully, which not only doesn't help the daughter in the slightest but his bully might do something far worse than bullying if he finds out the sensei just let the entire thing happen.