The subway system innervates Busan as well as any lymphatic system, offering cheap and easy transportation to anywhere you want to go. I use it so often that I bought a youth Mybi card for the additional discount it gives. It adds up if you're going places everyday to eat and party like I do, or if you're an unfortunate soul who commutes.
I only worked about 9 hours last week so I had time to do something nice for Busan noobies. Here's my map of all the significant neighborhoods of Busan with annotations. Of course it doesn't tell the whole story, that's what the rest of this blog is for.