May I know if anyone has recommendation for accomodation in Busan? And where would you recommend me to stay in Busan? I've read that Seomyeon is more convenient due to its central location, Gwangalli and Haeundae beach for near seaside. I'm looking for guesthouse or budget hotel thats near to subway station. Just want to hear some reviews if anyone here has been to Busan and stayed there. Thanks!

May I know whats the name of the hotel/hostel/guesthouse you stayed in?

Another general question, do I need to book my KTX tickets in advance, or I can just get them over the counter in Seoul station 2-3 days before my departure date. FYI, I'll be travelling on a weekday (tuesday). How much does the tickets normally cost? I checked the KTX website for reservation, it seems like they are not cheap, about 50k won one way (not sure if i selected the right thing or not). Anyone tried booking their tickets through the KTX website before?

Going to Korea next Monday. Backpack style.
Any apps recommended for me to download? Such as map, language etc ...

Thanks!!