The main itinerary of Tianhai Cruise in the new century is: Day 1 day: Shanghai-Day 2: Sea Cruise-Day 3: Nagasaki-Day 4: Jeju-Day 5: Shanghai.
Main itinerary of Costa Cruises Lucky: Shanghai-Jeju Island, South Korea-Fukuoka, Japan-Sea Cruises-Shanghai.
You can check the reservation in mango net.