Looking along the platform of the Seoul Metro Line 3 (수도권 전철 3호선) at Euljiro 3(sam)-ga station (을지로3가역) in Seoul (서울), South Korea (한국).
From Wikipedia (http://en.wikipedia.org/wiki/Seoul_Metropolitan_Subway):
The Seoul Metropolitan Subway, in Seoul, South Korea, is one of the most heavily used rapid transit systems in the world, with well over 8 million trips daily on the system's thirteen lines (total figures for Seoul Metro, Seoul Metropolitan Rapid Transit Corporation & Korail commuter lines).
The system serves Seoul, Incheon, Gyeonggi-do and northern Chungcheongnam-do. There is a connection to the Incheon International Airport Railroad (A'REX) at Gimpo Airport Station on Line 5 and a free transfer with the single-line Incheon Subway system at Bupyeong on Seoul Subway Line 1.
Over 70% of the total metro track length is underground. By 2008, all stations operated by Seoul Metro and SMRT are all installed with Platform Screen Doors, but only for Seoul area, excluding areas operated by Korail.
All directional signs in the Seoul Subway are written in both Korean and English. Station signs and some maps also display traditional Chinese. The pre-recorded voice announcement in the trains indicating the upcoming station, possible line transfer and exiting side are all in Korean followed by English, and in some cases Japanese then Chinese.