Agreed. Generally, only people from Delhi speak Hindi as a primary language. Provincials usually have language ability as: Local language > English > Hindi

South Korean employers also files taxes on behalf of employees. What exactly is the problem with that?

The buildings are definitely all low, but the important businesses all tend to be bunched together, like on Yeoui-do and in Gangnam. Also, most people live in highly dense, relatively tall (15ish story) apartment buildings.You could do a lot of damage both in casualties and economy very quickly if you chose the right targets.