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Other Income and Expenses (Tables) | 12 Months Ended
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Dec. 31, 2020
Other Income And Expense [Abstract] |
Summary of Details of Other Income | Details of other income for the years ended December 31, 2020, 2019 and 2018 are as follows:
|  | 2020 |  |  | 2019 |  |  |  | 2018 |
|  |  | (In millions of Korean won) |  |  |  |  |  |
Gain on disposal of property and equipment |  | W |  | — |  |  | W |  | 3 |  |  | W |  | 16 |
Reversal of other bad debt allowances |  |  |  | 2 |  |  |  |  | 35 |  |  |  |  | — |
Miscellaneous gain |  |  |  | 656 |  |  |  |  | 315 |  |  |  |  | 106 |
Total |  | W |  | 658 |  |  | W |  | 353 |  |  | W |  | 122 |
Summary of Details of Other Expenses | (2) Details of other expenses for the years ended December 31, 2020, 2019 and 2018 are as follows:
|  | 2020 |  |  | 2019 |  |  |  | 2018 |
|  |  | (In millions of Korean won) |  |  |  |  |  |
Loss on retirement and disposal of property and equipment |  | W |  | — |  |  | W |  | — |  |  | W |  | 5 |
Impairment loss on intangible assets |  |  |  | 115 |  |  |  |  | 52 |  |  |  |  | 623 |
Impairment loss on other non-current assets (*) |  |  |  | 1,456 |  |  |  |  | 434 |  |  |  |  | — |
Donation |  |  |  | 13 |  |  |  |  | — |  |  |  |  | — |
Miscellaneous loss |  |  |  | 180 |  |  |  |  | 7 |  |  |  |  | 14 |
Total |  | W |  | 1,764 |  |  | W |  | 493 |  |  | W |  | 642 |
(*) The Group recognized an impairment loss of Won 1,456 million in 2020 and Won 434 million in 2019 as the recoverable amount was less than the book value of minimum guaranteed royalties for the game in service.

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- Definition The disclosure of other operating expense. [Refer: Other operating income (expense)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 10 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_10_e&doctype=Standard -URIDate 2020-01-01 + Details
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