갑신정변
After treating Min Young-ik, a royal relative injured during the Gapsin Coup, Allen became close to the king of Joseon, Gojong. At his suggestion, Gojong founded the first western hospital, Chejungwon (now known as Severance Hospital). Allen was in charge of the core function of the hospital. A year after the establishment of the hospital, Allen started a medical school, which was the first formal medical education in Korea.