Breaking Into The Body Of The Emperor's Daughte summary:
Traveling through another world to become a rich young master, Su Changqing just wanted to be a low-key rich second generation and enjoy a happy life. Unexpectedly, he suddenly encountered a family change and accidentally discovered the emperor's daughter. I thought the empress would kill him by any means necessary, but she didn't expect that the empress took a fancy to his ability to change other people's faces and wanted him to be her male substitute. What Su Changqing didn't expect was that when he became the female emperor's male substitute, he would have to turn over the harem concubine's brand on the first day, and his leisurely little life would collapse...