If you have already bought a ticket, you can no longer buy a ticket that overlaps with the purchased ticket in terms of time and route. <br/>So you can no longer buy tickets for the same day (unless you get off before 12 o'clock), if you want to take the 9 o'clock bus, you can change the 12 o'clock ticket to 9 o'clock. <br/>If it helps you, please click Accept