This is Mengmeng's letter.

"Actually, I don't want to write anything, because our relationship is very good. I can write it or not. Then, I hope you are happy. I am a practitioner. You know that you will definitely touch it in the future. I will give you three kinds of Treasures, one is the exclusive token I specially made, if there is any trouble, you take the token and go to Crescent Mountain, the other necklace is a treasure that can preserve youth, and the last ring is something that protects oneself. We are together, it may be a long time to be separated now, and I am quite reluctant to part with you, but fortunately, I will come back, let’s say that again, when you want to practice in the future, I will take you to practice.”

It says 'Zhang Yumeng' on the back.