As I don't know the specific story, it's hard to say exactly. But there would likely be the 'wrong' teacher as a main character. There could also be students who were affected by this teacher's actions or presence.
Well, without more context, it's difficult to say a great deal about 'The Wrong Teacher' based on a true story. However, generally speaking, if it's based on a true story, it probably aims to expose some issues within the education system or human relationships in a school environment. For example, it could be about a teacher with unethical teaching methods or improper behavior towards students that was overlooked until the truth came out.
We can learn the importance of proper teacher selection. If there was a wrong teacher in the story, it shows that not enough scrutiny was given during the hiring process.