This document provides step-by-step instructions for purchasing train tickets using the Korail mobile app. It describes downloading the app, selecting travel details like date and stations, creating a user account, choosing seat type and seats, entering payment details, and viewing the purchased tickets. The app allows users to search for stations, select dates and times, buy tickets for multiple people, manually pick seats or let the system assign them automatically. Screenshots are recommended in case issues arise with the ticket display on the app.