We took the subway to 4 different places on different 2 days. Very convenient central train, across the road from the main train station. Staff helped a lot on system usage and payment. Site notification and map icon clear. Very good way to travel. The Busan subway impressed me very well, the instructions were clear, and the various billboards in the station were basically used in Chinese, British, Japanese and Korean, and were very friendly to foreign tourists. The subway crowd is not too much, and there are usually still seats to sit on, comfortable. However, there are very few elevators/escalators in the subway station and exit to the ground, and it is very hard to get up and down.