Am I the Cannon Fodder Female Supporting Character in the Book? ? ?

As a person from the 21st century, she was sleeping peacefully in her room. When she opened her eyes and entered a strange place, she said she was immediately stunned. The original owner licked the dog until he had nothing, and the regent stayed away from her with a face full of anger and disgust. She said that they would all be punished immediately. She just didn't expect that the regent who hated her would sometimes change his personality and temper, and the childhood sweetheart of the original owner devoted all his love to her. It wasn't until he accidentally discovered the secret one day that he realized that the other party had a huge secret...