Sŏk-chun Yi

• Kukka kyoyuk, inchŏk chawŏn tʻonggye sŏbisŭ kaesŏn pangan yŏnʼgu
• Kukka kyoyuk, inchŏk chawŏn tʻonggye sŏbisŭ kaesŏn pangan yŏnʼgu