Yeah, I don't think there will be a free use week. My theory or prediction, is It might be passion, love, sensual, Romance type theme.
I think this cause week 1 was pleasure, nice week, humaliation and pain are bad weeks, so end on a good theme. With love or Passion, the one you are romancing the most, who you have the most chemistry,will be the winner of the whole thing or given most time and helped if you are with Hana/Mina.
Also maybe if this the theme, during the week the Carnations goals can be to plan different dates, dinner, amusement park, picnic, riding a boat, etc.
So right now that is what I think the final week will be, basically Love, Romance,etc., but I could be wrong, we shall see.