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Finance Income And Costs (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure Of Finance Income And Costs [Abstract] |
Summary of Finance Income and Cost | Details of finance income and costs for the years ended December 31, 2020, 2019 and 2018 are as follows:
|  | 2020 |  |  | 2019 |  |  |  | 2018 |
|  |  | (In millions of Korean won) |
Finance income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  | W |  | 1,088 |  |  | W |  | 1,626 |  |  | W |  | 819 |
Unrealized foreign currency gain |  |  |  | 321 |  |  |  |  | 119 |  |  |  |  | 81 |
Gain on foreign currency transactions |  |  |  | 2,067 |  |  |  |  | 2,442 |  |  |  |  | 1,173 |
Total |  | W |  | 3,476 |  |  | W |  | 4,187 |  |  | W |  | 2,073 |
Finance costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized foreign currency loss |  | W |  | 682 |  |  | W |  | 267 |  |  | W |  | 99 |
Loss on foreign currency transactions |  |  |  | 2,965 |  |  |  |  | 1,050 |  |  |  |  | 891 |
Others |  |  |  | 186 |  |  |  |  | 277 |  |  |  |  | 12 |
Total |  | W |  | 3,833 |  |  | W |  | 1,594 |  |  | W |  | 1,002 |

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