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Earnings (Loss) Per Share Attributable to Owners of the Controlling Company (Tables)
12 Months Ended
Dec. 31, 2019
Text block [abstract]  
Summary of Basic Earnings per Share
 (a)
Basic earnings (loss) per share for the years ended December 31, 2017, 2018 and 2019 are as follows:
 
(In won and No. of shares)
            
   
2017
   
2018
   
2019
 
Profit (loss) attributable to owners of the Controlling Company
  
W
1,802,756,119,275    (207,239,484,774   (2,829,705,069,665
Weighted-average number of common stocks outstanding
   357,815,700    357,815,700    357,815,700 
  
 
 
   
 
 
   
 
 
 
Earnings (loss) per share
  
W
5,038    (579   (7,908