

South Korea is infamous for very high cost of living, especially considering the very low salaries.
You can check numbeo for more specific comparisons, but Seoul and Busan are only 20% and 30% cheaper in terms of cost of living compared to Atlanta GA, respectively. Not nearly enough to make up the salary difference.
The fact there there are migrant workers already tells you the situation. People’s behaviour generally follow economic incentives. There’s a reason why South Korea is struggling with emigration.
Usual suspects