Quarterly report pursuant to Section 13 or 15(d)

INVESTMENTS (Details 1)

v3.21.2
INVESTMENTS (Details 1) - Valuation Technique Binomial Monte-Carlo Cliquet Option Pricing Model [Member]
₩ / shares in Units, ₩ in Billions
6 Months Ended 12 Months Ended
Jun. 30, 2021
KRW (₩)
₩ / shares
Dec. 31, 2020
$ / shares
Dec. 31, 2020
KRW (₩)
₩ / shares
Schedule Of Investments [Line Items]      
Principal outstanding (South Korean won) | ₩ ₩ 30   ₩ 30
Stock price | (per share) ₩ 4,580 $ 1.23 ₩ 6,060
Conversion price | $ / shares   $ 2.00  
Expected Life (in years) [Member]      
Schedule Of Investments [Line Items]      
Expected life (in years) 9 years 3 months 18 days 9 years 9 months 14 days  
Selected Yield [Member]      
Schedule Of Investments [Line Items]      
Investment in convertible bonds, measurement input 9.00   10.50
Expected Volatility (Telcon common stock) [Member]      
Schedule Of Investments [Line Items]      
Investment in convertible bonds, measurement input 83.02   85.80
Risk-free Interest Rate (South Korea government bond) [Member]      
Schedule Of Investments [Line Items]      
Investment in convertible bonds, measurement input 2.04   1.72
Expected Dividend Yield [Member]      
Schedule Of Investments [Line Items]      
Investment in convertible bonds, measurement input 0.00   0.00
Conversion Price [Member]      
Schedule Of Investments [Line Items]      
Conversion price | ₩ / shares ₩ 4,546   ₩ 6,028