Wikipedia
Upass
Upass is a prepaid card for the transportation system in Seoul and its suburbs. This card is issued by Seoul Bus Transport Association and eB Card. Its parent-generation card is Seoul Transportation Card, a world-first commercial-used RF card for transportation (first used in June 1996)ยน. The Korean system integrator Intec and Seoul Bus Union first launched a test of their system in a trial from October to December 1995. Old Seoul Transportation Card and T-money can be used along with Upass.