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Cash and Cash Equivalents (Tables) | 12 Months Ended
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Dec. 31, 2018
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Summary of Restricted Cash and Cash Equivalents | Restricted cash and cash equivalents as at December 31, 2017 and 2018, are as follows:
(In millions of Korean won) |  | Type |  | December 31, 2017 |  | December 31, 2018 |  | Description
Restricted cash and cash equivalents |  | Restricted deposit |  | ￦16,837 |  | ￦23,970 |  | Deposit restricted for governmental project and others

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