Cracking open the window isn't a Korean thing, no. But feeling safe to do it literally anywhere in the country (including deprevated areas) is something you can do in Korea and I'd warn against in the states.
My point is that when the people designing the cars consciously or unconsciously don't think of theft as a concern, their cars might be easier to steal.
My point is that when the people designing the cars consciously or unconsciously don't think of theft as a concern, their cars might be easier to steal.