After swapping bodies with the princess, this prince slaughtered his way through the court and becam

Ren Jingxing transmigrates into the body of a fallen nobleman's son, and at the beginning, he swaps bodies with a princess.
【The Making of an Empress】: The Crown Prince and the Princess exchange souls every ten days. You must help the Princess ascend the throne.
As a result, every ten days, the princess and the crown prince would undergo a drastic change in temperament.
When Ren Jingxing wore the princess's clothes:
How dare the laundry maids humiliate the princess? They should be beaten!
The concubines deliberately framed the princess; let's deal with them directly! How dare even members of the imperial family interfere?
The palace was in a state of panic. Why was that timid princess suddenly so assertive?
When the princess dressed up as Ren Jingxing:
"My son has the potential to become a top scholar!"
"The young master got first place again!"
"The rumors are wrong; that纨绔子弟 (playboy) is actually the most talented scholar in the capital!"
Years later, Wei Xinyan ascended the throne as emperor, and Ren Jingxing held the highest position in the court, wielding immense power.
The Empress abdicated in his favor, her eyes filled with resentment: "Brother Crown Prince, this vast empire belongs to you, but the harem must be under my control!"