Take the subway to Oksu Station on Orange Line #3 or Turquoise Line GJ. The station is one station away from Apgujeong Station across the river. Come out of Exit #5 from Oksu Station. Directly in front, there should be small green local buses (마을 버스). Take Bus #9. Four stops away, get off at the Geuk-dong Apartments Stops (극동아파트상가). Walk across the street to the building with a parking lot. Go into the grocery store on the ground floor (B1), and take the elevator to the 4th floor.