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Capital
 12 Months Ended
Dec. 31, 2022
Disclosure of classes of share capital [abstract]  
Capital Capital
(1)Details of common shares as of December 31, 2022 and 2021 are as follows:
December 31,
2022		December 31,
2021
(In Korean won and number of shares)
Number of authorized shares40,000,000 40,000,000 
Value per share₩500 ₩500 
Number of shares issued6,948,900 6,948,900 
Common shares₩3,474,450,000 ₩3,474,450,000 
(2)Details of capital surplus as of December 31, 2022 and 2021 are as follows:
December 31,
2022		December 31,
2021
(In millions of Korean won)
Additional paid in capital₩25,292 ₩25,292 
Other capital surplus1,806 1,806 
Total
₩27,098 ₩27,098 
(3)Details of other components of equity as of December 31, 2022 and 2021 are as follows:
December 31,
2022		December 31,
2021
(In millions of Korean won)
Factors for re-measurement of defined benefit liabilities₩(4)₩(2)
Foreign currency translation adjustments2,479 2,182 
  Total₩2,475 ₩2,180 
(4)Details of retained earnings as of December 31, 2022 and 2021 are as follows:
December 31,
2022		December 31,
2021
(In millions of Korean won)
Unappropriated retained earnings₩296,480 ₩213,318 
(5)According to the Parent company's Articles of Incorporation, the Parent company may issue 2,000,000 shares of preferred stock without voting rights, and there are no preferred shares issued as of December 31, 2022 and 2021.