We already have a [question about prices of ferries from China to South Korea][1], my question is: **can I just show up at the port and buy a ticket for the same-day ferry or do I have to book it in advance?** 

I usually never know when I arrive somewhere or in this case when I will be ready to leave China, so ideally I don't want to make any advance bookings except when the prices are significantly cheaper.

I don't have a vehicle and I don't know yet which of the ferry routes I will use.


  [1]: https://travel.stackexchange.com/questions/23217/which-ferry-from-china-to-south-korea-is-the-cheapest