on ▁Sub way ▁system . ▁The ▁line ▁is ▁also ▁included ▁as ▁a ▁part ▁of ▁the ▁overall ▁Se oul ▁Metropolitan ▁Sub way ▁network ; ▁Juan ▁Station ▁has ▁a ▁free ▁transfer ▁with ▁Se oul ▁Sub way ▁Line ▁ 1 , ▁Ge om am ▁Station ▁connect s ▁with ▁the ▁A RE X ▁Line ▁to ▁In che on ▁International ▁Airport ▁and ▁Se oul ▁Station , ▁and ▁Se ong nam ▁will ▁eventually ▁have ▁a ▁free ▁transfer ▁with ▁Se oul ▁Sub way ▁Line ▁ 7 . ▁ ▁Line ▁ 2 ▁has ▁above ground ▁sections ▁north ▁of ▁A si ad ▁Stadium ▁and ▁east ▁of ▁Nam d ong - gu ▁Office . ▁ ▁History ▁ ▁June ▁ 2 6 , ▁ 2 0 0 9 : ▁Const ruction ▁begins . ▁The ▁price ▁of ▁building ▁the ▁line ▁was ▁ 2 ▁tr ill ion ▁K R W . ▁▁ ▁Early ▁ 2 0 1 6 : ▁Tri al ▁runs ▁begin . ▁ ▁July ▁ 3 0 , ▁ 2 0 1 6 : ▁The ▁line ▁opens , ▁after ▁seven ▁years ▁of ▁construction . ▁ ▁Line ▁ 2 ▁was ▁planned ▁to ▁open ▁in ▁August ▁ 2 0 1 4 , ▁but ▁the ▁opening ▁date ▁was ▁pushed ▁back ▁to ▁July ▁ 3 0 , ▁ 2 0 1 6 . ▁ ▁Rol ling ▁stock ▁and ▁signal ing ▁The ▁I TC ▁Line 2 ▁is ▁a ▁driver less , ▁fully ▁automatic ▁sub way ▁system . ▁The ▁line ▁uses ▁ 3 7 ▁two - car ▁trains , ▁all ▁of ▁which ▁were ▁built ▁in ▁ 2 0 1 3