Hmm, let's see:
Busan
510m
Daejon
450m
Seoul
615m
Seoul
332m
Apparantly this one's being built
Incheon
610m
Seoul
450m
Ilsan
450m
Busan
Unknown height
Incheon
305m
Actually under construction
Seoul
540m
Incheon
450m
Seoul
540m
Busan
560m
These are all I could find