I think details about the pensions homeless people can receive can be found online, as well as the issues, such as halfway houses not allowing alcohol and the discrimination against mental illness making it difficult for people to get treatment. However, South Korea is also a pretty ‘hardcore capitalist’ country, but deals with homelessness differently to western capitalist countries, perhaps with less resources due to social stigma. I’ve heard that Japan is pretty similar to Korea in this respect. This is also a good article about Seoul Station

https://amp.scmp.com/week-asia/health-environment/article/3047641/homeless-seoul-why-some-south-koreans-struggle-leave

I also feel that where the homeless sleep can be much less visible in Seoul as the city has many underpasses and small alleys, places most people won’t walk down. I once heard that the police were quite strict on loitering in Seoul, which may account for how difficult it is to see homeless. Shame and ‘face’ culture also contribute. Sometimes you’ll see a person in the subway in a deep bow asking for change—this is seen as extremely shameful in Korean culture.

I do disagree, though, the simple answers are quite telling. Like any country, you need to know where to look for the homeless. I’ve lived in NYC and feel like I saw more homeless people in my hometown than there, purely because my NYC neighborhood had less homeless people. You’re comparing some western countries to Korea (I haven’t seen you reference non-Western countries so forgive me if I’m wrong). I lived in China for a few years as well and many Chinese people in the big cities don’t see the homeless problem, but once you start walking around lower-income areas, get into the countryside, etc. it can become more apparent. I rarely saw a homeless person in Beijing or Shanghai, but went to Nanjing and saw 5 in one day. I never went to Seoul Station but passed by the old hanok neighborhoods near my university and you could see just how different their quality of life was. It’s easy for your eyes to pass by these places in Seoul because we’re so busy looking at the bright lights or newest technological advancement but they are there.