The Seoul City Tour night Han River/Namsan trip differs from a day hop-on/hop-off ticket. It is a single non-stop departure with no reboarding; the operator says at least 10 passengers are needed. The FAQ gives a 7 p.m. departure, or 7:30 p.m. from May to August. It departs on time. Ask the operator on 02-777-6090 about same-day availability; same-day online booking is unavailable. Standard cancellation refunds are 100% three days ahead, 90% two days, 80% one day, and 70% on the day. However, the night tour is nonrefundable if canceled after noon on the travel day. Check live departure and fares.