You can also buy 2nd-hand Japanese or Korean comic books at 1000won each so come by and immerse yourselves in these books. Next for dinner, you can go to the back street near Sinchon station exit 2 and try chicken galbi in this restaurant.
It might be strange to see this man hanging around trying to get customers but the food was great and many locals love to come to this restaurant. This dish included chicken and lots of vegetables like cabbage and beansprouts and the staff cooked it in front of us.
Even though we ordered enough for 2 people, I think this is definitely enough for 4 people as you can ask for rice or noodles to go with this.
We also asked for seafood topping (we weren't really sure but anyway..) it came with big squid and extra vegetables and after cooking, they added extra chilli sauce (though the staff kept telling us that it's not spicy).
It might not be spicy however korean food usually get spicier and spicier as you enjoy them so be prepared for it.
For the grilled pork lovers, you should also walk around the back lanes as the restaurants offer as low as 3500 won per portion and it is interesting to sit around and watch how the koreans spend their night on the weekends. So check out the link at http://www.youtube.com/watch?v=-A2NN40h8ug
Have fun in Korea!