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Capital - Summary of Other Components of Equity (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Foreign Currency Translation Adjustments |  |
Disclosure Of Accumulated Other Comprehensive Income [Line Items] |  |
Foreign currency translation adjustments | ₩ (1,045) | ₩ 275

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