蔡溫
Sai On was born in Kumemura, the village within the major port city of Naha which served as the chief center of classical Chinese learning in Okinawa, and the source of the vast majority of the scholar-bureaucrats who were raised to serve in the administration of the kingdom. His father had likewise been a scholar-bureaucrat of Kumemura, educated in the Confucian classics, and had served on several tribute missions to China. Sai On's father wrote the "Chūzan Seifu" by rewriting the "Chūzan Seikan" in 1701. Unlike "Chūzan Seikan", which was written in Japanese Kanbun, "Chūzan Seifu" is written in Classical Chinese. Sai On edited "Chūzan Seifu" in 1724, and it is believed that this was to give the work a pro-Chinese point of view.