Why Did the Prince Regent Become Ill After His Rebirth?

In his previous life, the little emperor imprisoned the regent. The regent suffered terribly. Before his death, the little emperor suddenly realized in a foreign country that the regent was the one who had always been kind to him, and the general he had always trusted turned out to be a white-eyed wolf. After all, he still doesn't know people well. The little emperor who came back to his new life was determined to be nicer to the regent. But no sooner had he been reborn than he made the regent angry. Later, the little emperor discovered that the regent in this life was actually riddled with diseases, and suffered from heart and chest pains from time to time. Whenever he was emotionally excited, he would suffer from severe heart and chest pains. How can rebirth be so easy? It's just that some people paid the price of never ending their lives and living forever in exchange for a new life. I hope the little emperor can truly understand people's hearts this time. Intention: Recognize the human heart clearly