Original sentence: Seongsu Station is a rapid transit station  on Seoul Subway Line 2
Edited sentence: Exits 3 and 4 service mainly mixed-use residential and commercial buildings as well as the Seongsu E-mart which is adjacent the Seongsu 2ga 1 dong resident center.In 1983 Seongsu Station was split as the Line 2 circle was extended by nine stations to Euljiro 1-ga Station.It was built on October 31, 1980 at the intersection of Guui Road (구의로) and Seong-Sam Road (성삼길).It would be another eight months before the circle line was completed in May of 1984.One block from exits 1 and 2 is the Seongsu Lotte Castle luxury apartment complex.Past the Lotte Castle is a riverfront park area which is situated on a small branch of the Han river the branch runs east briefly and then turns north at Hwayang-dong.Seongsu Station () is a rapid transit station  on Seoul Subway Line 2.The Sinseol-dong line became known as a branch line at this time.The exits on the station are paired at either end of the station.The initial section of Line 2 ran from Sinseoul-Dong to the Sports Complex Station in Jamsil-dong.The station features several small shops, including convenience stores, clothing shops, and other variety stores.The station is an elevated platform with 2 islands.The station is part of the original set of stations which made up the first phase of Line 2.There are washroom facilities in the middle of the main concourse.They are not separated by ticket gates which allows passengers and pedestrians to walk the full length of the station.This complex contains several residential apartment towers, as well as small shops and park facilities for children and residents.Within a 200 meters from all exits there are several small community parks including Seongsu Green Park and Hyanglim Park