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Revenue from Contracts with Customers - Changes in Contract Liabilities (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenue From Contracts With Customers [Abstract]      
Balance at January 1 ₩ 10,846 ₩ 20,074 ₩ 22,681
Increase related to micro-transaction and subscription revenue 29,124 66,232 12,017
Increase related to royalties and license fees 14,330   540
Increase related to website and application development contract 4,580 5,038 834
Decrease upon satisfaction of performance obligations - micro-transaction and subscription revenue (24,980) (69,507) (12,409)
Decrease upon satisfaction of performance obligations -royalties and license fees (15,426) (5,407) (3,066)
Decrease due to termination of contract   (413) (495)
Decrease upon satisfaction of performance obligations (4,681) (5,171) (28)
Balance at December 31 ₩ 13,793 ₩ 10,846 ₩ 20,074