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Revenue from Contracts with Customers - Transaction Price Allocated to Unsatisfied Performance Obligations (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure Of Transaction Price Allocated To Remaining Performance Obligations [Line Items] |  |  |
Total - Transaction price allocated to unsatisfied performance obligations | ₩ 13,793 | ₩ 10,846 | ₩ 20,074
Micro-transaction and Subscription Revenue |  |  |
Disclosure Of Transaction Price Allocated To Remaining Performance Obligations [Line Items] |  |  |
Total - Transaction price allocated to unsatisfied performance obligations | 12,886 | 8,742 | 12,017
Micro-transaction and Subscription Revenue | Online Game |  |  |
Disclosure Of Transaction Price Allocated To Remaining Performance Obligations [Line Items] |  |  |
Total - Transaction price allocated to unsatisfied performance obligations | 8,418 | 5,358 | 6,160
Micro-transaction and Subscription Revenue | Mobile Game |  |  |
Disclosure Of Transaction Price Allocated To Remaining Performance Obligations [Line Items] |  |  |
Total - Transaction price allocated to unsatisfied performance obligations | 4,468 | 3,384 | 5,857
Royalties and License Fees |  |  |
Disclosure Of Transaction Price Allocated To Remaining Performance Obligations [Line Items] |  |  |
Total - Transaction price allocated to unsatisfied performance obligations | 307 | 1,403 | 7,223
Royalties and License Fees | Online Game |  |  |
Disclosure Of Transaction Price Allocated To Remaining Performance Obligations [Line Items] |  |  |
Total - Transaction price allocated to unsatisfied performance obligations | 286 | 573 | 7,203
Royalties and License Fees | Mobile Game |  |  |
Disclosure Of Transaction Price Allocated To Remaining Performance Obligations [Line Items] |  |  |
Total - Transaction price allocated to unsatisfied performance obligations | 21 | 830 | 20
Website and Application Development |  |  |
Disclosure Of Transaction Price Allocated To Remaining Performance Obligations [Line Items] |  |  |
Total - Transaction price allocated to unsatisfied performance obligations | ₩ 600 | ₩ 701 | ₩ 834

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- Definition The amount of the transaction price allocated to the performance obligations that are unsatisfied (or partially unsatisfied) as of the end of the reporting period. The transaction price is the amount of consideration to which an entity expects to be entitled in exchange for transferring promised goods or services to a customer, excluding amounts collected on behalf of third parties (for example, some sales taxes). [Refer: Performance obligations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2020-01-01 -Paragraph 120 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_120_a&doctype=Standard -URIDate 2020-01-01 + Details
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