On day 3 in South Korea, we went to the Demilitarized Zone (DMZ) Peace Tour with Seoul City Tour which we booked via the Klook app. It was a half-day morning trip and we were back by 3pm, which gave us time to do other activities. For this trip, we were all required to bring our passports for checking as we were entering the military area. If you don’t have any ID, you will be refused entry.