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Transactions with Related Parties - Summary of Transactions with Related Parties (Details) - GungHo Online Entertainment, Inc - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of transactions between related parties [line items] |  |  |
Revenue | ₩ 36,647 | ₩ 21,833 | ₩ 27,484
Purchases | ₩ 55 | ₩ 211 | ₩ 60

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