Please recommend an ancient novel about rebirth. Urgent!

The female protagonist was reborn after death. After a series of life and death struggles in prison, she walked out and became a palace maid. At that time, the female protagonist said to the eunuch who chose the criminal,"I'll do whatever you want me to do." (It seemed to be this sentence) Previously, the female lead had walked through a hot iron plate to express her feelings. Then, the female lead was also very scheming in the palace. In order to take revenge for her previous life, the female protagonist supported the most unfavored prince. When they first met, Nan Zhu was forced to eat dog food by the other princes. The female protagonist thought that Nan Zhu could yield and endure, so she sent medicine to Nan Zhu at night. In order to use his identity as a prince to pave the way for revenge in the future. I didn't see the ending. It seems that Nan Zhu became the emperor and fell in love with the female protagonist... The following is a selection from the text: 1. At that moment, everything was born. (This was how Nan Zhu looked when he smiled for the first time) 30% gentle, the remaining 70% indifferent. People on the streets were like jade, and Young Master Shi Wushuang was just like this. (This is the description of the character when the prince saw the female protagonist kneeling on the snow and taking the brocade coat for her.) It was a description of another prince, but in the end, the female protagonist didn't want it. (It seems so... The woman's every step was unusually firm, leaving a row of light footprints on the snow. (This is a description of the female lead's back.) Please help me! Urgent request! The book seems to have more than four words Kneel and beg!