1. The letter of apology is not a legal document. It only needs my signature or handprint. After all, it is my own subjective will to prove that I apologize.

2. A copy of the ID card will risk revealing privacy. You should never give it to others or institutions unless it is necessary. If the apology letter is accompanied by ID card information, some criminals may do bad things by stealing ID card information, so don't write an ID card.