Mosque Al-Fatah is located at Dusil station exit 8, then go straight walk about 200 meter until you see SK petrol station and signboard Islam Center then turn to right walk about 30 meter the mosque is behind the Cappadocia Turkey halal restaurant.
Easy to access from train stasiun, and not very far. Unfortunately, on weekdays, the mosque does not use. I mean, when we wanted to have maghrib pray, the mosque was close. So we prayed downstair, in the office/little hall. Big enough to have jamaah, but of course less small than the mosque. It's not our luck to see the inside of the mosque. But we were already very happy to find this place and met other muslim brothers in Busan. If you go to Busan on Friday, please go there, because they only have Friday pray for jamaah inside the mosque. Other than that, if you want to pray, just knock the door downstair, and they will welcome you happily.