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Segment Information - Summary Revenue from External Customers by Country (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of geographical areas [line items] |  |  |
Revenue | ₩ 413,938 | ₩ 405,953 | ₩ 360,967
Korea |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 73,751 | 109,895 | 45,273
Taiwan |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 77,462 | 100,049 | 52,118
Japan |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 40,259 | 22,500 | 28,469
The United States of America |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 20,894 | 20,659 | 55,062
Thailand |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 94,475 | 59,086 | 62,043
The Philippines |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 20,173 | 23,690 | 30,951
Indonesia |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 10,723 | 12,729 | 22,355
Malaysia |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 30,422 | 23,121 | 13,511
Other |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | ₩ 45,779 | ₩ 34,224 | ₩ 51,185

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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 2021-01-01 -Paragraph 113 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2021-en-r&anchor=para_113_a&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2021-01-01 -Paragraph 114 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2021-en-r&anchor=para_114&doctype=Standard -URIDate 2021-03-24 + Details
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