Overall the most useful Seoul metro app I found.
Three areas to improve:
1. Indicate fares
2. Not all transfers suggested are possible with a single trip ticket. Notably the transfer at Noryangjin from line 1 to 9. Would be nice to have a setting to avoid this for people without a T-money card
3. No indication on schedule which trains are express trains. Would need to indicate which stops are skipped for these too
sbauser about Seoul City Metro - Seoul, South Korean Subway Guide, v1.1.6