Since before I came to Jeollanam-do, Gwangju's sort of had new subway lines planned. The map on the subway station site has for as long as I can remember always shown three lines. Currently there's a single line running west to east, and while I am really impressed by how clean the cars and the stations are, few people use it because it serves such a limited strip of town. It doesn't connect to the bus terminal, Gwangju Station, Chonnam National University, or my house, among other places.
This map from the Gwangju subway website, which I've seen since about 2006, does not reflect current reality, or the planned changes.
Today the plans for line two were announced, and they don't resemble that map up there. Line two (광주지하철2호선) will run in a circle and will connect to, among other places, City Hall, Chonnam National University, Chosun University, World Cup Stadium, and Gwangju Station. An extension will run from Gwangju Station to the bus terminal and over to City Hall, and another extension will go from Songjeong Park subway station north to Unnam Jigu. Construction should start next year.