Korea, as you might know, has a very strong internet slang culture, and this is one of them. It basically says: "Hello, the address is on the back of the invitation picture(letter)."

Agree with Kelly

Actually I don't really understand what you want to say in Korean. I don't think that is a proper sentence. I just guessed as " hello, you can find the address on the back of the photo? of the invitation?? "