Song Zuo and Liu Xinhuan were childhood playmates, but Liu Xinhuan lost his memory and could not remember him. When Liu Xinhuan's man in the mirror reminded Liu Xinhuan to look for Song Zuo, Song Zuo became an immortal.
After Song Zuo became the immortal envoy, he only came back twice. Once Liu Xinhuan didn't wake up, and the second time Liu Xinhuan woke up.
But he didn't seem to remember him.
He often said some incomprehensible words that Song Zuo couldn't understand at all.
Motto: There is always someone to remember for you.