Xia Yinyin, a transmigrator with a modern soul, returns to her rightful identity as the biological daughter of a marquis's household. She knows she is living inside a novel, where her entire family will suffer the tragic fate of execution because they dote excessively on their adopted daughter, Xia Yubing. Her main goal is to use her knowledge of the plot to protect her family and defy her doomed fate. Her family's attitude gradually changes from initial shock and suspicion to wholeheartedly protecting and trusting Xia Yinyin.