A letter written by Wei Zi when Huanzhugege first left Erkang.

"Er kang, tens of thousands of sorry, I'm leaving! Now, the swallow has settled down, and my mind is gone. It's time for me to float away! Although there are countless disappointments in my heart, there are also countless comforts! During my stay in your home, I have experienced feelings I have never experienced in my life, and finally know what is called' commitment to life and death' and what is called' unforgettable! I didn't live in vain, I didn't know you in vain! Thank you for all your kindness to me. Please don't be sad for my leaving! I take all your kindness to me, leaving my thoughts and blessings together! Farewell! Please take care of the swallow for me! Take care of your parents and ertai! Liu Ziwei "