First of all, students in the student union should also abide by the law and don't hit people for no reason.

It depends on the injury of the injured.

If the other party is slightly injured, it should be okay to apologize and pay more money!

But he may tell the teacher or something!

If the other party is seriously injured and intentionally hurts others, he may be convicted of intentional injury.

Whoever intentionally harms another person's body as stipulated in China's criminal law shall be sentenced to fixed-term imprisonment of not more than three years, criminal detention or public surveillance.

Those who cause serious injuries shall be sentenced to fixed-term imprisonment of not less than three years but not more than ten years;

Whoever causes death or serious injury by particularly cruel means and causes serious disability shall be sentenced to fixed-term imprisonment of not less than 10 years, life imprisonment or death.