go to Hong dae university area it is good to meet girls, they will talk to you just to practice english..
also
Sincheon is a party zone, go there...girls are everywhere in seoul..just be nice, it helps to be good looking...if you are and can put up with a korean girls whining, you will enjoy your stay..lol
you can pick up girls in itaewon man, local girls go there, just find the right bar.
last time i went out me and my buddy ended up in a small bar, the only other guy there was an american soldier, who was not allowed to be there he said..lol
Anyway, it was just us for awhile and we were having drinks, the bartender was a 10, so we sat at her bar.
Then later without us realizing the bar filled up with about 20 korean local girls just out to drink and have fun. the US soldier was there for another staff member, so it was just my buddy and i. Good times.
stay out of whiskey bars and other such places...just find a place where local korean girls go