The good side of the communist regime in North Korea is that ethnic isolation. South Korea - of sure - has more immigrants, but even the southern korean nation is not so pro immigrants too. What do you think?

"• Japan and the Koreas are the most homogenous. Racial politics can be complicated and nasty in these countries, where nationalism and ethnicity have at times gone hand-in-hand, from Hirohito's Japan to Kim Il Sung's North Korea. The lack of diversity perhaps informs these politics, although it's tough to say which caused which."

Source: https://www.washingtonpost.com/news/...=.86026675e99b