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Financial Risk Management (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure Of Financial Instruments [Abstract] |
Schedule of Company's Debt to Equity Ratio | The debt ratios as of December 31, 2020 and 2019 are as follows:
|  | 2020 |  |  | 2019 |  |
|  |  | (In millions of Korean won) |  |
Total liabilities |  | W |  | 88,024 |  |  | W |  | 59,659 |  |
Total equity |  |  |  | 177,348 |  |  |  |  | 115,766 |  |
Debt-to-equity ratio |  |  |  | 50 | % |  |  |  | 52 | % |
Schedule of Financial Assets and Liabilities Exposed in Foreign Currency Risk | The Group is exposed to foreign exchange risk arising from royalty revenues and commission payment primarily with respect to the US dollar and etc. The Group’s financial assets and liabilities are exposed to foreign currency risk as of December 31, 2020 and 2019 are as follows:
|  | December 31, 2020 |
|  | Financial assets |  |  | Financial liabilities |  |  | Financial assets |  |  | Financial liabilities |
|  | (In each foreign currency) |  |  |  | (In millions of Korean won) |
USD |  |  | 29,204,905 |  |  |  | 15,715,800 |  |  | W |  | 31,775 |  |  | W |  | 17,099 |
JPY |  |  | 388,760,925 |  |  |  | 198,432,867 |  |  |  |  | 4,099 |  |  |  |  | 2,092 |
EUR |  |  | 344,842 |  |  |  | 8,399 |  |  |  |  | 461 |  |  |  |  | 11 |
IDR |  |  | 12,955,000 |  |  |  | 15,289,944 |  |  |  |  | 1 |  |  |  |  | 1 |
THB |  |  | 28,510 |  |  |  | 7,379 |  |  |  |  | 1 |  |  |  |  | — |
TWD |  |  | 105,408,193 |  |  |  | 3,264,754 |  |  |  |  | 4,076 |  |  |  |  | 126 |
VND |  |  | 9,270,000 |  |  |  | 3,243,600 |  |  |  |  | — |  |  |  |  | — |
Total |  |  |  |  |  |  |  |  |  | W |  | 40,413 |  |  | W |  | 19,329 |
|  | December 31, 2019 |
|  | Financial assets |  |  | Financial liabilities |  |  | Financial assets |  |  | Financial liabilities |
|  | (In each foreign currency) |  |  |  | (In millions of Korean won) |
USD |  |  | 8,100,729 |  |  |  | 5,775,721 |  |  | W |  | 9,403 |  |  | W |  | 6,696 |
JPY |  |  | 456,300,430 |  |  |  | 340,468,613 |  |  |  |  | 4,854 |  |  |  |  | 3,621 |
EUR |  |  | 338,598 |  |  |  | 1,000 |  |  |  | 439 |  |  |  | 1 |
IDR |  |  | 12,955,000 |  |  |  | 17,023,944 |  |  |  | 1 |  |  |  | 1 |
THB |  |  | 28,510 |  |  |  | 7,379 |  |  |  | 1 |  |  |  |  | — |
TWD |  |  | 29,236,669 |  |  |  | 5,567,672 |  |  |  |  | 1,125 |  |  |  | 214 |
VND |  |  | 9,270,000 |  |  |  | 3,243,600 |  |  |  |  | — |  |  |  |  | — |
GBP |  |  | — |  |  |  | 5,625 |  |  |  |  | — |  |  |  | 9 |
HKD |  |  | 368,048 |  |  |  | — |  |  |  | 55 |  |  |  |  | — |
Total |  |  |  |  |  |  |  |  |  | W |  | 15,878 |  |  | W |  | 10,542 |
Summary of Impact of Fluctuation in Foreign Currency Exchange Rates on Group's Monetary Assets and Liabilities | The impact of a 10% fluctuation in foreign currency exchange rates on the Group’s monetary assets and liabilities as of December 31, 2020 and 2019 are as follows:
|  | December 31, 2020 |  |  | December 31, 2019 |
|  | 10% Increase |  |  | 10% Decrease |  |  | 10% Increase |  |  | 10% Decrease |
|  |  | (In millions of Korean won) |
USD |  | W |  | 1,468 |  |  | W |  | (1,468 | ) |  | W |  | 271 |  |  | W |  | (271 | )
JPY |  |  |  | 201 |  |  |  |  | (201 | ) |  |  |  | 123 |  |  |  |  | (123 | )
Others |  |  |  | 440 |  |  |  |  | (440 | ) |  |  |  | 140 |  |  |  |  | (140 | )
Total |  | W |  | 2,109 |  |  | W |  | (2,109 | ) |  | W |  | 534 |  |  | W |  | (534 | )
Summary of Maximum Exposure to Credit Risk | The carrying amount of a financial asset represents the maximum exposure to credit risk. The maximum exposure to credit risk of the Group as of December 31, 2020 and 2019 are as follows.
|  | December 31, 2020 |  |  | December 31, 2019 |
|  |  | (In millions of Korean won) |
Cash and cash equivalents |  | W |  | 110,632 |  |  | W |  | 79,428 |
Short-term financial instruments |  |  |  | 71,000 |  |  |  |  | 39,500 |
Accounts receivable |  |  |  | 59,761 |  |  |  |  | 32,253 |
Other receivable |  |  |  | 8 |  |  |  |  | 56 |
Other current financial assets |  |  |  | 818 |  |  |  |  | 233 |
Other non-current financial assets |  |  |  | 1,324 |  |  |  |  | 1,770 |
Total |  | W |  | 243,543 |  |  | W |  | 153,240 |
Summary of Financial Liabilities by Maturity | The following table summarizes the financial liabilities of the Group by maturity according to the remaining period from the end of the reporting period to the contractual maturity date.
|  | December 31, 2020 |
|  | Carrying value |  |  | Less than 3 months |  |  | 3 months ~ 1 year |  |  | 1~2 years |  |  | 2~3 years |  |  | 3~5 years |  |  | Total |
|  |  | (In millions of Korean won) |
Accounts payable |  | W |  | 54,090 |  |  | W |  | 43,438 |  |  | W |  | 9,250 |  |  | W |  | 1,402 |  |  | W |  | — |  |  | W |  | — |  |  | W |  | 54,090 |
Accrued expenses |  |  |  | 62 |  |  |  |  | 62 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |  |  |  | 62 |
Other liabilities (*) |  |  |  | 5,900 |  |  |  |  | 812 |  |  |  |  | 2,107 |  |  |  |  | 2,146 |  |  |  |  | 597 |  |  |  |  | 733 |  |  |  |  | 6,395 |
Total |  | W |  | 60,052 |  |  | W |  | 44,312 |  |  | W |  | 11,357 |  |  | W |  | 3,548 |  |  | W |  | 597 |  |  | W |  | 733 |  |  | W |  | 60,547 |
(*) Other liabilities as at December 31, 2020 consist of lease liabilities.
|  | December 31, 2019 |
|  | Carrying value |  |  | Less than 3 months |  |  | 3 months ~ 1 year |  |  | 1~2 years |  |  | 2~3 years |  |  | 3~5 years |  |  | Total |
|  |  | (In millions of Korean won) |
Accounts payable |  | W |  | 37,689 |  |  | W |  | 21,374 |  |  | W |  | 16,122 |  |  | W |  | 193 |  |  | W |  | — |  |  | W |  | — |  |  | W |  | 37,689 |
Accrued expenses |  |  |  | 1,175 |  |  |  |  | 1,175 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |  |  |  | 1,175 |
Other liabilities (*) |  |  |  | 4,994 |  |  |  |  | 598 |  |  |  |  | 1,653 |  |  |  |  | 1,780 |  |  |  |  | 1,029 |  |  |  |  | 428 |  |  |  |  | 5,488 |
Total |  | W |  | 43,858 |  |  | W |  | 23,147 |  |  | W |  | 17,775 |  |  | W |  | 1,973 |  |  | W |  | 1,029 |  |  | W |  | 428 |  |  | W |  | 44,352 |
(*) Other liabilities as at December 31, 2019 consist of lease liabilities.

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