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Operating Expenses (Tables) | 12 Months Ended
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Dec. 31, 2020
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Summary of Operating Expenses | Operating expenses for the years ended December 31, 2018, 2019 and 2020, are as follows:
(In millions of Korean won) |  | 2018 |  |  | 2019 |  |  | 2020 |
Salaries and wages |  | ￦ | 3,845,842 |  |  | ￦ | 3,974,233 |  |  | ￦ | 4,123,680 |
Depreciation |  |  | 2,674,205 |  |  |  | 2,530,252 |  |  |  | 2,605,128 |
Depreciation of right-of-use assets |  |  | — |  |  |  | 442,629 |  |  |  | 404,175 |
Amortization of intangible assets |  |  | 607,527 |  |  |  | 656,611 |  |  |  | 624,982 |
Commissions |  |  | 1,080,168 |  |  |  | 1,115,477 |  |  |  | 965,461 |
Interconnection charges |  |  | 579,613 |  |  |  | 534,025 |  |  |  | 500,081 |
International interconnection fee |  |  | 226,627 |  |  |  | 240,254 |  |  |  | 172,529 |
Purchase of inventories |  |  | 4,414,094 |  |  |  | 4,453,820 |  |  |  | 3,681,801 |
Changes of inventories |  |  | (432,607 | ) |  |  | 282,957 |  |  |  | 257,041 |
Sales commission |  |  | 1,942,841 |  |  |  | 2,315,731 |  |  |  | 2,337,127 |
Service cost |  |  | 1,540,869 |  |  |  | 1,610,261 |  |  |  | 2,102,875 |
Utilities |  |  | 323,411 |  |  |  | 332,816 |  |  |  | 360,797 |
Taxes and dues |  |  | 285,131 |  |  |  | 277,742 |  |  |  | 283,197 |
Rent |  |  | 460,377 |  |  |  | 193,357 |  |  |  | 136,355 |
Insurance premium |  |  | 73,654 |  |  |  | 82,404 |  |  |  | 71,018 |
Installation fee |  |  | 143,669 |  |  |  | 155,178 |  |  |  | 132,117 |
Advertising expenses |  |  | 157,675 |  |  |  | 150,166 |  |  |  | 132,466 |
Research and development expenses |  |  | 176,758 |  |  |  | 165,028 |  |  |  | 156,940 |
Card service cost |  |  | 3,112,618 |  |  |  | 3,066,766 |  |  |  | 2,941,669 |
Others |  |  | 1,122,718 |  |  |  | 1,292,512 |  |  |  | 1,428,875 |
Total |  | ￦ | 22,335,190 |  |  | ￦ | 23,872,219 |  |  | ￦ | 23,418,314 |
Summary of Details of Salaries and Wages | Details of salaries and wages for the years ended December 31, 2018, 2019 and 2020, are as follows:
(In millions of Korean won) |  | 2018 |  |  | 2019 |  |  | 2020 |
Short-term employee benefits |  | ￦ | 3,505,214 |  |  | ￦ | 3,663,337 |  |  | ￦ | 3,770,786 |
Post-employment benefits(Defined benefit plan) |  |  | 232,045 |  |  |  | 240,310 |  |  |  | 239,102 |
Post-employment benefits(Defined contribution plan) |  |  | 48,210 |  |  |  | 57,170 |  |  |  | 61,912 |
Share-based payment |  |  | 8,439 |  |  |  | 6,398 |  |  |  | 28,604 |
Others |  |  | 51,934 |  |  |  | 7,018 |  |  |  | 23,276 |
Total |  | ￦ | 3,845,842 |  |  | ￦ | 3,974,233 |  |  | ￦ | 4,123,680 |

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