What is the relationship between A Journey to Find Past Lives and Ye Yin by Yin Si? What is Yin Si's real identity?

Yin Si, the hero, protoss and future emperor of Vivi Bear's journey to find past lives, became the emperor in the search for past lives, lived for tens of thousands of years, and created Sha Yi with one of his own ribs. Later, he became the master of Sha Yi's reincarnated soul boy Ye Yin and birds, and asked them to collect tears. Sharjah used to be cold and did a lot of wrong things. After being indoctrinated by Sha Yi with "the sound of killing God", he only has one soul and one soul. He came to earth with Silver to look for pieces of his soul, collected tears and returned to heaven.

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