What I like about their subway is that all stations have English translation.
They also installed automatic platform gates for safety of the passengers.
Lost? Not to worry. There's a touchscreen kiosk called Digital View in all stations that work like a smart phone with installed applications like virtual maps and tour guides. Photo grabbed from Daum.
Strong network connections such as 3G, 4G/LTE, and WiFi signals are accessible in all stations and moving subway cars so you're literally connected everywhere you go.
I recommend getting your own T-money card upon arrival in Seoul. It is a transportation card as well as a device used to pay for transportation fares (bus, taxi and subway) and transactions at convenience stores. Photo from Visit Korea.
Spotted huge mirrors and beauty/cosmetic shops along the hallways of different subway stations.
I truly believe now that Koreans are really really and I mean REALLY vain. Lol.