We are the one who makes our choices, we should shoulder the backlash of our choices, The emperor should be the on who knows it best. With just one choice, everything collapses. He'll be miserable all his life for the sake of his country—his empress doesn't love him because he killed her lover. I mean, Lalattile and the emperor both faced the same situation, another royalty rebel to be the crown but Lalattile made the right choice, seeking help for other foreign countries. The emperor chose the easiest way to deal with the problem that's why he end up paying for his mistakes. You should just move on and let your ex girlfriend be happy with her dayum concubines (◍•ᴗ•◍)(◍•ᴗ•◍)