What are the examples of "revenge by a gentleman is never too late" in history?

Tell a decades-long revenge story and an amazing inspirational history. During Jiajing period of Ming Dynasty, Chen Hu, a farmer from Hebei Province, offended a eunuch who entered the palace to handle affairs. So, Chen Hu was defeated. Chen Hu is determined to retaliate. He found that eunuchs were so powerful. I must act quickly. So he sent someone to castrate his son, Chen Ju, and then sent Chen Ju into the palace to be a eunuch.

Fifty years later, Chen Ju, his son, became the eunuch in this promising industry (No.1), the ultimate boss-the eunuch who supervised the palm seal, and also served as the most powerful eunuch in the early years of Wanli-the prefect of Dongchang. This is not the whole story. Because later, farmer Hu Chen was beaten again.

This time, Chen Hu offended a juren and sent someone to fight Chen Hu. It seems that eunuchs are not insured, and scholars are the real hooligans. Chen Hu made up his mind again, and the Revenge 2.0 plan was officially launched.

This time, Chen Hu sent his other son, Chen Wance, to learn revenge. Chen Hu's son, Chen Wance, later became a high school scholar. I don't know where it is better than lifting people.

Unfortunately, Emperor Jiajing never defeated Chen Hu.