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Revenue from Contracts with Customers - Details of Revenue from Contracts with Customers based on Service Contract and Timing of Satisfaction of Performance Obligations (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items] |  |  |
Revenue | ₩ 405,953 | ₩ 360,967 | ₩ 286,770
At a Point in Time |  |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items] |  |  |
Revenue |  | 175 | 8
Over Time |  |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items] |  |  |
Revenue | 405,953 | 360,792 | 286,762
Micro-transaction and Subscription Revenue |  |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items] |  |  |
Revenue | 328,070 | 310,006 | 260,888
Micro-transaction and Subscription Revenue | Online Game |  |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items] |  |  |
Revenue | 76,110 | 30,751 | 25,897
Micro-transaction and Subscription Revenue | Mobile Game |  |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items] |  |  |
Revenue | 251,960 | 279,255 | 234,991
Others |  |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items] |  |  |
Revenue | 18,084 | 16,742 | 7,828
Royalties and License Fees |  |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items] |  |  |
Revenue | 59,799 | 34,219 | 18,054
Royalties and License Fees | Online Game |  |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items] |  |  |
Revenue | 13,435 | 11,571 | 13,556
Royalties and License Fees | Mobile Game |  |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items] |  |  |
Revenue | ₩ 46,364 | ₩ 22,648 | ₩ 4,498

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- Definition The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2020-01-01 -Paragraph 113 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_113_a&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2020-01-01 -Paragraph 114 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_114&doctype=Standard -URIDate 2020-01-01 + Details
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