Meant To Be Yours / Another Life AU / Goldendragon Ship 

In the newly formed reality, Mei's name was LiMei and she was evil like Canon Red Son, but her family did not know about it.
Moreover, LiMei had Samadhi Fire and almost destroyed the world.
Until MK puts her on the good side.
LiMei was extremely surprised at MK's good heart and soul, that he didn't see her as a monster.
And she fell in love with him.
In fact, before MK took over his reincarnated body, LiMei and MK were lovers, LiMei was even too obsessed with MK.
But when MK got his body back and learned about his relationship with Mei, he gained his 2nd trauma :D