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Finance Income And Costs - Summary of Finance Income And Cost (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Finance Income And Costs [Line Items] |  |  |
Finance income | ₩ 3,476 | ₩ 4,187 | ₩ 2,073
Finance costs | 3,833 | 1,594 | 1,002
Interest Income |  |  |
Disclosure Of Finance Income And Costs [Line Items] |  |  |
Finance income | 1,088 | 1,626 | 819
Unrealized Foreign Currency Gain |  |  |
Disclosure Of Finance Income And Costs [Line Items] |  |  |
Finance income | 321 | 119 | 81
Gain on Foreign Currency Transactions |  |  |
Disclosure Of Finance Income And Costs [Line Items] |  |  |
Finance income | 2,067 | 2,442 | 1,173
Unrealized Foreign Currency Loss |  |  |
Disclosure Of Finance Income And Costs [Line Items] |  |  |
Finance costs | 682 | 267 | 99
Loss on Foreign Currency Transactions |  |  |
Disclosure Of Finance Income And Costs [Line Items] |  |  |
Finance costs | 2,965 | 1,050 | 891
Others |  |  |
Disclosure Of Finance Income And Costs [Line Items] |  |  |
Finance costs | ₩ 186 | ₩ 277 | ₩ 12

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