Don't worry Rajatetra, my friends and I in the midst of compiling halal places to eat in Seoul for muslims travelllers. Once I got my list complete, I will post it here. I'll post it here within 1 week.

you can change RM in korea but its very limited.. only certain banks have RM. so don't take the risk. change to USD if you need to as spare so that you can go thr and change to won.

Eating place for Muslim travelllers:

Myeongdeong area
Myeongdong Andong Jjimdak & Bulgogi
Location: Myeongdong Station Exit 6 -2nd lane opposite Binsbean Cafe

Mr Pizza
Myeongdong Station Exit 6 - 2nd lane (selling seafood and vegan pizza)

Yukaney
Myeongdong Station Exit 7 - From Myeongdong main road straight to the junction  until u  see Nature Republic on the left. Turn right and then straight until you reach left junction. You can see Yukaney's signboard

Kebab at Namdaemun
Hoehyeon Station Exit 6 - u can see the shop from the main road

Dongdaemun
Jeonju Sikdang or Ikan Bakar
Dongdamun Station Exit 8 - walk straight until u see Daemyong building. Turn right and then turn left to the 2nd alley

Nami Island
Cafe Yeonga Jiga (Cafe Drama). This cafe located between Nami Historium and Winter Sonata Gallery.

Rajatetra, for more list of halal makan place, pls refer to page 1 of this thread.

I was told the price ranging from KR4000-KR14,000 depending on what type of food and also location.  For example, restaurant are slightly higher than street food stall.