How to go to South Korea from Shanghai by cruise?

Hello, Anchalee. What is your exact destination in South Korea? Anyway, many international cruises are scheduled at the Wusongkou International Cruise Terminal. The destinations there include Jeju, Busan, Seoul and Inchon. Some of them pass the ports in Japan too. You may choose a suitable one according to your destination. The contact of Wusongkou is 86-021-66593501 by the way.

Thank you for your reply. I would like to go to Seoul on 11 April ,2017. Which cruise and how long to go there. And how long in cruise to arrive Seoul. And cruise is big?

I am afraid that there is no cruise to Seoul departing on April 11, 2017. The Mariner of the Seas Cruise depart at 16:30, April 9 and lasts for 6 days 5 nights. It arrives in Seoul at 7:00, April 11. The cruise is quite big and luxury. :)