Someone charged me the wrong phone bill of 100. He called me and asked me to recharge it for him, but I didn't have any money on me, and neither did my card. I have 20.

This is very simple. Just reply directly to the other party and identify yourself, saying that you are still a student and don't have 100 yuan on you. 20 yuan's money alone can't make up for your current loss. Charge him if he has money 100. Just keep in touch. But in real life, Jiang. Under normal circumstances, no one will seriously care about 100 yuan. But in terms of personal moral quality, even 100 yuan is necessary. The moral standard of hitting 100 yuan. Students should behave like students. That's what a man should do. Keep your word. Because in society, such petty gains cannot be greedy.