I will say I haven't seen Princess Agents ( not into cliffhanger endings) so while I was hearing positive things it wasn't high on my radar. Finally took a chance on it while I was between dramas and now understand what the hype was about.
Leads had great chemistry, no long drawn out love triangles. There was actually some growth in the secondary leads as well which you don't often seen.
Love the OST and added some songs to my Spotify.

The ending - I actually like that last episode was a small side story and just show the main characters living their life.