Korea Subway System

The Seoul Metropolitan Subway is one of the biggest, most heavily used transit system in the world serving 8 million passengers daily. There are nine lines, symbolized by colors that connects Seoul to nearby cities in Incheon, Gyeonggi and provinces in northern Chuncheong. It's the cheapest, most convenient way to get around. Ticket starts at 1,000 won, and you don't need to pay again when you transfer. It's more convenient to use transportation card like T-money and U-pass when using the subway. It saves you time as you don't have to go thru the hassle of paying and getting the ticket at the ticket booth. You could also get a 100-won discount each time you use the subway if you use any of their transportation cards. Credit card also works fine, and I prefer to use this over U-pass or T-money because you don't have to load it again and again.

Here's how the subway in Korea looks like.