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Other Income and Expenses - Summary of Details of Other Income (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other Income And Expense [Abstract]
Gain on disposal of property and equipment		₩ 3	₩ 16
Reversal of other bad debt allowances	₩ 2	35
Miscellaneous gain	656	315	106
Total	₩ 658	₩ 353	₩ 122

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- Definition

Bad debt expenses reversal of other bad debt allowances.

+ References

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Other income and expense.

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- Definition

The gain on the disposal of property, plant and equipment. [Refer: Property, plant and equipment]

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- Definition

The amount of miscellaneous other operating income. [Refer: Other operating income (expense)]

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- Definition

The amount of operating income that the entity does not separately disclose in the same statement or note.

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