I navigate this every day:
ya of course. I'm just saying that there's a great deal of the book devoted to history, which unless new information is found doesn't really change. As I said, you can't compete with the internet if you're looking for the most up to date information, but if you're looking for an interesting read or at least want to gain an understanding of the featured systems up until that point in time then it's a good source.
But Seoul's problem remains that there are like 80 er so independent bus route companies. They need to put them all together. The subway expansion hurt the bus usage, overall in the last 30 years. But more oughta be done to reduce the number of these operators.