Korea, Metro Navi is a free Android application developed by Salvino Napolione, designed to make navigating Seoul's vast subway system easier. With its user-friendly interface, the app provides a comprehensive Seoul subway map view that helps users plan their journeys with ease.

The app's key features include path departure station - arriving station (minimum time, minimum transit, take sigandeung), station timetables, and catch last subway. Additionally, the app comes with an arrived alarm that alerts users when they have arrived at their destination. The app also supports Korean language providing ease for locals.

Overall, Korea, Metro Navi is a must-have app for anyone traveling to Seoul or living in the city. It is user-friendly, accurate, and provides all the necessary information to navigate the city's subway system effectively.