In 1047, he was promoted to the position of chancellor (문하시중; 門下侍中; munha sijung).

[2] Ch'oe founded the School of Nine Studies [ko] (구재학당; 九齋學堂; kujae haktang) in the capital city of Kaegyong, a private school for the children of aristocratic families to prepare them for the civil service examinations.

The success of the school and its pupils led other leading Confucian scholars to establish similar own private educational institutions.

Due to Ch'oe's efforts in popularizing the private school system, his contemporaries would nickname him the "Confucius of Korea".

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