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Financial Instruments by Category - Schedule of Net Income and Expenses From Financial Instruments (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Financial liabilities at amortized cost | Interest expense |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Income and expenses on financial liabilities at amortized cost | ₩ (115) | ₩ (186) | ₩ (277)
Financial liabilities at amortized cost | Differences in foreign currency |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Income and expenses on financial liabilities at amortized cost | (821) | 537 | (22)
Financial assets at amortized cost | Interest income |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Income and expenses on financial assets at amortized cost | 1,355 | 1,088 | 1,626
Financial assets at amortized cost | Differences in foreign currency |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Income and expenses on financial assets at amortized cost | 2,135 | (1,796) | 1,267
Financial assets at fair value through profit or loss | Interest income |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Income on financial assets at fair value through profit or loss | ₩ 28 | ₩ 0 | ₩ 0

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