Woah i didn't know Ilsan was that cold, I've been there lots of time also during the winter but it was never as cold as Seoul. Snow in traffic is so crap, yesterday it took my 1hr to get from gangnam to myeogdong by taxi, it's probably only around 10km at max. Yeah it's dangerous also, these days the system is so organised here that the army/police comes to move the snow or they have massive machines or tractor kind off things. Argg one thing i hate about seoul is the dreadful population density and traffic.