In Thailand, there is a famous king. His name is, his father is from Guangdong and his mother is from Thailand. Because he was half China, they could have a good relationship with the Qing Dynasty, but then something happened in Thailand and Zheng Xin was killed. In order to continue the friendly relations with the Qing Dynasty, the later kings pretended to be descendants of Zheng Xin and maintained good relations with the Qing Dynasty. From then on, every king will take this surname as China's name.

In his early years, Zheng Xin was a very good king. He led Thai soldiers to pacify the border war and recover Thailand. When he first ascended the throne, he really paid more attention to people's livelihood and development. Under his leadership, Thailand's national strength was relatively strong, and Zheng Xin's China identity had a good relationship with the Qing Dynasty, and he gained some resources to some extent.

Later, because Zheng Xin had changed, he ordered people to worship him as a god, but his proposal met with opposition. Moreover, there were many natural disasters at that time, and the people's lives were not guaranteed at all. The people regarded him as a god, and the pressure was great, so his good friend went out to mutiny, killing not only Zheng Xin, but also the prince, so Rama I changed his country name after he ascended the throne. But he still wanted to have a good relationship with the Qing Dynasty, so he pretended to be Zheng Xin's son. Of course, the emperors of the Qing Dynasty were not too suspicious. After all, it's so far away. Therefore, in order to get some assistance or materials from the Qing Dynasty, every generation of emperors pretended to be descendants of Zheng and used Zheng to change the name of China.