Lol
He who fights a cheater should see to it that he himself does not become a cheater!

In this situation, black king is in check. So the first white move must be taken to protect the king.
So we have one move left which must be a checkmate. So the white king must be in d3 or c3 so black can deliver the mate.
If WK is in d3 we have:
If WK is in c3 we also have:
So the answer is 1.Rb3+ Bxb3+ 2.Qxb3#
very nice. the invisible king has been spotted

What is this invisible king thing? Is is that anywhere you put the white king with black to move it's mate in two at most?
Edit: White's King has cheated and made himself invisible but he won't remain invincible!
Black to play and Mate in 2.
Note: ONLY the White King is invisible, the remaining pieces are as illustrated in the diagram.