Moon Jae-in, South Korean opposition Democratic United Party presidential candidate, leaves a voting booth to cast his ballot in South Korea's presidential election at a polling station in Busan, South Korea, on Wednesday, Dec. 19, 2012. (AP Photo/ Yonhap, Kim Hyun-tai)

Photo by: Kim Hyun-tae

Moon Jae-in, South Korean opposition Democratic United Party presidential candidate, leaves a voting booth to cast his ballot in South Korea's presidential election at a polling station in Busan, South Korea, on Wednesday, Dec. 19, 2012. (AP Photo/ Yonhap, Kim Hyun-tai)