As much as my shipping heart would love more romatic progress for Song-Sung couple, my mind understands why we got so little – Jiwon has to first face her childhood trauma and heal to be able to have a healthy relationship.
And if we look closely there actually is quite some progress, Sungmin is more and more caring and being the supporting man in the background (well, sometimes fighting at the front line) and Jiwon more and more turns to him for help (even if she thinks he is her servant, hehe… 😀 )

But, but, but….there better be plenty of skinship and couple scenes in the third season!!!