Why did Zhang hurt himself?

Well, is it a friend of the landlord? If so, in fact, netizens are not superman, and there is no way to know what is going on.

But I can probably guess that she is not very cheerful and depressed on weekdays. It's just that a deadly straw fell on her and made her explode.

Maybe she is a little sissy, but she is too timid to take it out on others and hurt herself.

Regarding self-harm, no one wants to tell others that those wounds are made by themselves. They always find excuses to save their self-esteem and don't want others to peek into their hearts. If you hurt yourself and tell others that you did it yourself, such a person is either grandstanding or has forgotten those things.