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Capital (Tables)
 12 Months Ended
Dec. 31, 2021
Disclosure of classes of share capital [abstract]  
Summary of Common Shares Details of common shares as of December 31, 2021 and 2020 are as follows:
December 31,
2021		December 31,
2020
(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 
Summary of Capital Surplus Details of capital surplus as of December 31, 2021 and 2020 are as follows:
December 31,
2021		December 31,
2020
(In millions of Korean won)
Additional paid in capital₩25,292 ₩25,304 
Other capital surplus1,806 1,806 
Total
₩27,098 ₩27,110 
Summary of Other Components of Equity Details of other components of equity as of December 31, 2021 and 2020 are as follows:
December 31,
2021		December 31,
2020
(In millions of Korean won)
Factors for re-measurement of defined benefit liabilities₩(2)₩— 
Foreign currency translation adjustments2,182 (1,045)
  Total₩2,180 ₩(1,045)
Summary of Retained Earnings Details of retained earnings as of December 31, 2021 and 2020 are as follows:
December 31,
2021		December 31,
2020
(In millions of Korean won)
Unappropriated retained earnings₩213,318 ₩147,371