Rebirth of Imperial Love

I thought she was a noble princess, but unexpectedly she was just a pawn in the struggle for imperial power! She was wandering among three people with different identities, different generations, and different statuses, all of whom might become heirs to the throne! Should we give up what we love in order to repay a favor, or should we give up everything for love? Could they give up the throne for her? With whom did he finally achieve enlightenment?