Summary
If you make 177,600,000 원 a year living in South Korea, you will be taxed 52,776,044 원. That means that your net pay will be 124,823,956 원 per year, or 10,401,996 원 per month. Your average tax rate is 29.7% and your marginal tax rate is 41.5%. 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 41.53 원, hence, your net pay will only increase by 58.47 원.
Bonus Example
A 1,000 원 bonus will generate an extra 585 원 of net incomes. A 5,000 원 bonus will generate an extra 2,924 원 of net incomes.