Why is Kangxi's temple name "Holy Father"? He should be the "Sejong" with the same name as the temple of Emperor Wu of the Han Dynasty! But upgraded to a "saint"? Thank you for your questions.
Zu is the founding emperor and Zong is the king who keeps his promise. Before the Tang Dynasty, not every emperor had a temple name. After the Tang Dynasty, the temple names of emperors began to flood, and almost every emperor had a temple name. In the Qing dynasty, temple names became more and more rampant. San huang called Zu, and after the death of Dourgen, it was also the temple name of the emperor, and even added a temple name to Chongzhen. So the sejong of Emperor Wu of the Han Dynasty is true, and the sage of Kangxi is water.