Will it work? Yes.
Will it work perfectly? No.
This board is meant for lower end CPU's, up to i5 CPU's (not oveclocking). So in my mind that is not a level of board for an i7 9700K (just to address your title.. i7 9700K, right? As you have 'i9 9700K' in the title).
I would rather suggest a Z390 Aorus Elite (if you truly want to go Intel and not 3700X.. *cough*)