The Princess's Temporal Ruins

After transmigrating, a fallen princess finds herself living among ordinary people. A royal princess from the last century, she gets to experience modern high-tech life, only to be captured and taken back again. That's when she realizes that transmigrating from the past to the present is a premium perk, while going from the present to the past is just asking for trouble. Of course, she never wanted to go back in the first place. It was all because of a disloyal young knight with no sense of professional duty. It wasn't enough for him to break her heart; he had to ruin her wonderful life, too.