That Kendo brother didn't save people, saying it was for the hero, but that was just an excuse, actually because he was afraid.
The hero originally said that there was no way to tell the Kendo brothers not to care about the things on the bus, but the Kendo brothers made an excuse to say that they didn't save people because of him, but they were actually afraid. The hero was bullied once, and the Kendo brothers were his only hope. However, after the bus incident, the protagonist saw clearly that society is the law of the jungle and there is no way to change it. He can understand that others don't save lives, but his once most respected and beloved Kendo brothers not only don't save lives, but also use themselves as an excuse, which is unforgivable. At the same time, he sympathized with the bullied people on the bus and felt the same way. He thinks someone should do something. The hero thinks that others have nothing to do with him, and he loves the Kendo brothers, so he is very disappointed that the Kendo brothers didn't save people. It can be said that he hates and despairs. He also thinks that the Kendo brothers have the ability to save people, but they have no action, so he thinks that the Kendo brothers have to pay the price (that is to say, in the hearts of heroes, compared with those bullies)
The female teacher in the infirmary is Chai's daughter, Chai Tian Dove. In the first season, she was 7 years old and could feel the girl in hell. In the third season, she grew up and became a health care doctor, which will be mentioned later!
The above is purely personal understanding and opinion, please forgive me if there is anything wrong ~!