Dreaming Back to Welcome the Dynasty

It develops within reason but has an unexpected ending. The contract marriage between the daughter of the duke and the son of the general. The seemingly peaceful palace is full of doubts. The heroine travels through the dream but becomes more and more confused. However, she has been in love with the hero for a long time. She tries hard to change the tragic ending of the people around her. However, all efforts are in vain. The heroine repeatedly fights for the hero's life. Will history be rewritten...