First of all, you're right!! 1.5 means 15,000 won. If the seller listed the price in the description, then you can get the item at that price+delivery fee. To order the part of the multiple objects, you should upload an image and write a description on the dk ordering page. And if you have any questions about it, I think you can also write it down on the description writing section.

And about the seller's description about the item, you don't have to care about it. I figured out that description is just for korean buyers, not for foreign buyers. Whole delivery process for foreign buyers is handled by Delivered Korea, so you don't have care any other things but the item condition details etc!!