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Revenue from Contracts with Customers (Tables)
 12 Months Ended
Dec. 31, 2022
Revenue From Contracts With Customers [Abstract]  
Details of Revenue from Contracts with Customers Based on Service Contract and Timing of Satisfaction of Performance Obligations Details of revenue from contracts with customers based on the service contract type and the timing of satisfaction of performance obligations are as follows:
202220212020
(In millions of Korean won)
Service contract
Micro-transaction revenue
Online game₩80,147 ₩64,382 ₩76,110 
Mobile game261,622 164,646 251,960 
341,769 229,028 328,070 
Royalties and license fees
Online game9,109 10,988 13,435 
Mobile game97,150 155,518 46,364 
106,259 166,506 59,799 
Others15,590 18,404 18,084 
463,618 413,938 405,953 
Timing of satisfaction of performance obligations
At a point in time25 8 — 
Over time463,593 413,930 405,953 
₩463,618 ₩413,938 ₩405,953 
Account Receivables, Incremental Costs of Obtaining a Contract, and Contract Liabilities Accounts receivables, incremental costs of obtaining a contract, and contract liabilities related to contracts with customers as of December 31, 2022 and 2021 are as follows:
20222021
(In millions of Korean won)
Accounts receivable₩77,257 ₩52,615 
Incremental costs of obtaining a contract (Prepaid expenses)1,722 861 
Contract liabilities (Deferred revenue)18,574 13,579 
Micro-transaction revenue16,788 12,622 
Royalties and license fees101 116 
Website and application development1,685 841 
Transaction Price Allocated to Unsatisfied Performance Obligation Transaction price allocated to unsatisfied performance obligations as of December 31, 2022, 2021 and 2020 are as follows:
202220212020
(In millions of Korean won)
Micro-transaction revenue
Online game₩9,918 ₩9,374 ₩8,418 
Mobile game6,869 3,248 4,468 
16,787 12,622 12,886 
Royalties and license fees
Online game49 96 286 
Mobile game52 21 21 
101 117 307 
Website and application development1,686 840 600 
Total₩18,574 ₩13,579 ₩13,793 
Details of Incremental Costs of Obtaining Contract Recognized as Assets Details of incremental costs of obtaining a contract recognized as assets as of and for the years ended December 31, 2022 and 2021 are as follows:
December 31,
2022		December 31,
2021
(In millions of Korean won)
Incremental costs of obtaining a contract₩1,722 ₩861 
Details of Amortization Costs Recognized as Cost of Revenues
Details of incremental costs of obtaining a contract recognized as cost of revenues as of December 31, 2022, 2021 and 2020 are as follows:
202220212020
(In millions of Korean won)
Incremental costs of obtaining a contract recognized as cost of revenues₩861 ₩1,277 ₩998