In Korea, there are a lot of foreigners : immigrant wives, migrant workers, travelers, language teacher, etc. Most of readers reading this entry are foreigners. If you ever visited Korea, you would be feeling you were a total stranger and weren't easily accepted by Korean. You would see lots of Koreans giving you an odd look around and you may feel like you are the one whom people pay a lot of attention to as if you are a monkey in cage. Nobody want to have a these disgusting experience. Maybe because the population of Korea has been a nation-state country, with very few foreigners, this can't be easily improved in the near future.
As I said above paragraph, the homogeneous factors make Korean recognize foreigner, especially those who are racially different from them, in the different way in compared to the same. They sensitively react about every crime caused by foreigners. For instance, a year ago one Russian committed multiple acts of arson. Though arson could be committed by either Koreans or foreigners, many media were focusing on the culprit of the arson was non other than foreigner. The media, being much interested in gossips and sensational news, occasionally say that foreigners may be a stumbling block to solving the high unemployment rate.
The son of multicultural family is another serious matter we should deal with carefully. Many multicultural sons are usually the object of bullying in Korean school because they have distinctive and different features such as the color of skin and their appearance. However, a lot of foreigners reside here and some of them are women who have married Korean men. It's obvious that the number of the multicultural family will be increasing. Besides, foreign workers, especially southern-east Asian workers, are working in the 3D jobs Koreans usually shun. If Korean continue not embracing foreigners as their neighbors, given the situation that Korea will be in danger of a chronic workforce shortage someday, it's like they are harming themselves, in terms of country's survival.
I can easily find those who make derogatory remarks targeting foreign workers and delay payment of wage on purpose. I think, in a few decades, Korea may need to enact an anti-racism law both to subsist and prevent social conflict.