located_in_the_administrative_territorial_entity sanseong station
Sanseong Station is a railway station on ___MASK40___ Subway Line 8 . ___MASK40___ Metropolitan Rapid Transit Corporation ( SMRT ) was established in 1994 to operate the ___MASK40___ Subway lines 5 , 6 , 7 , 8 in ___MASK40___ , South Korea . ___MASK40___ Subway Line 8 of the ___MASK40___ Metropolitan Rapid Transit Corporation was built 1990 - 99 and mainly serves the southeastern parts of ___MASK40___ and ___MASK17___ . Moran to Amsa was opened July 1999 . Its color is rose . ___MASK17___ is the second largest city in South Korea ' s Gyeonggi Province after Suwon and the 10th largest city in the country . Its population is approximately one million . ___MASK17___ is a satellite city of Seoul . It is largely a residential city located immediately southeast of Seoul and belongs to the Seoul National Capital Area .