Summary
If you make 98,500,476 원 a year living in South Korea, you will be taxed 21,981,009 원. That means that your net pay will be 76,519,467 원 per year, or 6,376,622 원 per month. Your average tax rate is 22.3% and your marginal tax rate is 29.0%. This marginal tax rate means that your immediate additional income will be taxed at this rate. For instance, an increase of 100 원 in your salary will be taxed 29 원, hence, your net pay will only increase by 71 원.
Bonus Example
A 1,000 원 bonus will generate an extra 710 원 of net incomes. A 5,000 원 bonus will generate an extra 3,550 원 of net incomes.