Is Korea a racist country?

I think Korea is a racist country. Lots of foreigners live in Korea. Especially foreign workers.
A lot of Korean people discriminate against foreign workers.
For example, foreign workers are worked a lot of time. But someone employers are discriminative treatment. They don't give even foreign worker's salary,too.
In this example, if Korean workers bring different conclusion. But the other way, some foreign workers have bad behavior. Example violence problem. So, because of that problem, we discriminate against them. In the end, foreign workers are visitors in Korea. So we should respect to foreigners if foreigners have not bad behavior.