On her wedding day, she broke into the affair between her long-time boyfriend and her best friend, and was killed by the angry two.
It was also the wedding day, and she was so ashamed and angry that she threw herself into the lake and committed suicide.
Two souls in two time and space are so closely connected.
When she opened her eyes again, she had become that gorgeous woman, taking revenge on the scumbag, bravely fighting against the evil concubine, and finally becoming a queen.