I’ve never been to South Korea, but Seoul metropolitan area is said to be a hypercapitalistic hell-hole. The major employers are the chaebols, or the family-owned corporations including Samsung, Hyundai and LG. They have toxic work cultures but is tolerated because they are major employers in the country, especially in Seoul, where half of South Koreans live. Nearly everyone is overworked for little pay resulting in poor birth rate because everyone have little time to spend with partners and families (the South Korean government actually created a new administrative capital city, Sejong, as an experiment to address the declining birth rate, and it worked by and large experiencing probably the only and highest population growth in the country).
Moreover, many North Korean defectors are still seen with suspicion and discriminated. So they feel alienated like the man in the article. I guess the best bet for defectors is to work in Sejong as a government clerk, where they could get generous welfare and employment benefits and protections, unlike corporate-employed workers.
Edit: autocowreck
Sejong is still a new city to be fair. Also, there is not much jobs there so far, except for civil servants. But the worst crime of all in creating that new city is that public transport is lacking! How could city planners have that oversight! There is more info from Caspian Report about the Sejong city.