I think there are only three reasons for their dispute:
1, in love life. The man in black obviously has the purpose of hurting the man in white hat, which means that the two of them should have known each other before or met each other. Then there is a possibility that the man in a white hat is more ambiguous with the wife of a black dress person, and finally it is discovered by the black dress person, which leads to the disgust of the black dress person, and this will happen. But this is also my first guess.
2. Business partners. My second guess is that they invested in some businesses together, but the man in the white hat finally got the benefit. The men in black not only lost money, but also lost a lot of money, which greatly affected their lives. That's why I have this idea about people in white hats.
3. Things between the children of both parties. This is my third guess. It is possible that the children of men in black were bullied by the children of men in white hats. The man in black was very angry and stabbed the man in white hat.
Although this incident did not cause much damage in the end, the white hat man was only injured and his life was not in danger. The man in black will not be punished too much, but if the white hat man insists on suing, the man in black may be jailed for it.
The above is my own opinion. Welcome to express your views and opinions in the comments section below.