The Last Empress had a great week in Nielsen drama ratings during the Wednesday-Thursday time slot, but this time it found itself in a tight race for first: 
Ep. 43 –  12.2%
Ep. 44 –  15.9%

What’s the Problem Poong Sang? is the drama that is narrowing the gap. It set another series high as it reached double digits for the first time including going over 12%:
Ep. 17 –   7.8%
Ep. 18 – 11.0%
Ep. 19 – 11.8%
Ep. 20 – 12.7%

Spring Turns to Spring stayed well behind the others in last:
Ep. 09 – 1.9%
Ep. 10 – 2.0%

The Last Empress airs Wednesday and Thursday on SBS.

What’s the Problem Poong Sang? airs Wednesday and Thursday on KBS.

Spring Turns to Spring airs Wednesday and Thursday on MBC.