Quarterly report pursuant to Section 13 or 15(d)

INVESTMENTS (Details 1)

v3.22.1
INVESTMENTS (Details 1) - Valuation Technique Binomial Monte-Carlo Cliquet Option Pricing Model [Member]
₩ / shares in Units, ₩ in Billions
 3 Months Ended 12 Months Ended
Mar. 31, 2022
$ / shares
Dec. 31, 2021
$ / shares
Mar. 31, 2022
KRW (₩)
₩ / shares
Dec. 31, 2021
KRW (₩)
₩ / shares
Schedule Of Investments [Line Items]        
Principal outstanding (South Korean won) | ₩     ₩ 26.5 ₩ 30.0
Stock price | ₩ / shares     ₩ 2,410 ₩ 2,925
Expected Life (in years) [Member]        
Schedule Of Investments [Line Items]        
Expected life (in years) 8 years 6 months 18 days 8 years 9 months 14 days    
Selected Yield [Member]        
Schedule Of Investments [Line Items]        
Investment in convertible bonds, measurement input     11.00 10.50
Expected Volatility (Telcon common stock) [Member]        
Schedule Of Investments [Line Items]        
Investment in convertible bonds, measurement input     80.43 81.31
Risk-free Interest Rate (South Korea government bond) [Member]        
Schedule Of Investments [Line Items]        
Investment in convertible bonds, measurement input     2.94 2.19
Conversion Price [Member]        
Schedule Of Investments [Line Items]        
Conversion price | (per share) $ 1.82 $ 2.39 ₩ 2,140 ₩ 2,847