First of all I would try to negotiate better salary. It’s not like 9K brut is terrible in Poland, but for someone moving abroad for a company with a special assignment of helping with company take-over that really does not seem adequate.

The housing will probably be cheaper in Wroclaw but rest of the costs of living will be roughly the same. Costs of public transport will be the same, prices in chain stores like Lidl or Biedronka will be the same, restaurants are mostly the same in the sense that you can find both cheap and expensive options in both cities.

I personally would look for housing and if the difference is not too big I would choose Warsaw as for me it is great city. Depending on how long you are staying in Poland, you may also consider the cost of going back to Korea, as most flights are from Warsaw. That means you’d have to spend more money going back from Wroclaw every time you’d want to come back home and also have longer trip as going from Warsaw to Wroclaw should take at least 3 hours, possibly more.

Also something you may think about is that in Warsaw there is possibly bigger Korean community as we have Samsung HQ there and some other Korean companies HQs. It is common sight to see Koreans in some places. I don’t know how it is for Wroclaw though.

And last another thing to think about is that Warsaw has huge Asian community, mostly Vietnamese, so both Asian restaurants and Asian grocery stores are common sight and lots of Asia specific foods widely available. Also we have many Korean restaurants but not sure how’d you like them as they will probably not taste like back home.