Expat life: Japan vs China vs Korea

China vs. Japan vs. South Korea

I've been looking around the web for information on (Western) expat living in the far east, and wanted to ask you guys your opinions. Some of the info is outdated and I know there's been recent changes, for example I heard that Shanghai is less open to expats now versus before 2013. I was hoping to get some opinions and experiences from people who have very recently lived in, or are currently living in one of these three countries.

I'm on the younger side and have no children / family. I'd be considering the major metropolitan cities (for example, Shanghai, Tokyo, Seoul.) I'd also love to hear from people in Singapore, Hong Kong, and Taiwan. Preferably I'd like a city with a vibrant nightlife, and an ability to get by without being fluent in the local language. (I'm hoping with the great translation apps these days that would be ok for the most part.) I've also seen that there's earbuds that translate across languages in real time. A large expat community is also important to me.

Additionally, I'm interested in the what the environment is like for foreigners running their own business.

I am an American currently living in Los Angeles.

I look forward to hearing from you all! Feel free to give any information, recommendations, personal experiences beyond those what I specifically mentioned as well.

by Square_Outcome_1652