Maps actually pretty good if you live in Busan and know Seomyeon.
If you walk on the other side of the road from Judies Taehwa away from Lotte Department store you will get to Pagoda Hagwon. Take the next right and then first right. If you see Kyobo bookstore on the other side of the street you've gone to far.
That whole street is full of bars and noraebangs etc.
Here is a Naver street map. Click on the X in the top right to return to map view