Technically, Wiedersehen can be broken down into "sehen" (see), and "wieder" (again). I think this question was a bit tricky.
Why can't it also be Wiedersehen, Ja?
auf wiedersehen = see you soon
in fact when one is ending telephone conversations they say auf wiederhoren meaning talk/speak to you soon :))
So what is the right answer for "see you soon" in German?