Coffee (or tea) is ludicrously expensive here in Seoul. Typically four and half USD, perhaps 5USD.
In Korea 5USD could buy a large meal, so it’s totally out of proportion.
I used to think 2.5AUD for a coffee was expensive in Melbourne!
They also do not serve you the coffee. They have to boom with the PA systen over the coffee house environment to announce your Latte is ready.