In August 1945, when Japan was defeated and Korea was liberated, Korea was faced with a variety of political tasks. One of such was democratization. In September 28, 1945, Dr. Yim reopened the Chung-Ang Training School for Kindergarten Teachers and set the school’s motto as "Live in Truth, Live for Justice." By then, the mission of Chung-Ang was no longer to regain political independence though education, but to develop human resources for the newborn republic.
In addition, Dr. Yim upgraded Chung-Ang Training School for Kindergarten Teachers to Chung-Ang Junior Women's College in October 1945, to Chung-Ang Women's College in 1947, and to Chung-Ang University, the first co-educational institution in Korea, in 1948. While serving as the school’s president and chairman of the board, Dr. Yim also worked as Korean representative in the United Nations during the Republic of Korea foundation process.
After the school celebrated its first conferment of bachelor's degrees in 1945, it had to be temporarily closed down due to the Korean War. Yet, it soon resumed its operations after it relocated its campus to Pusan, where it produced its second, third, and fourth batches of graduates by the end of the war.