I don't know why there is a need to compare this to Princess Agents, PA is a serious melodrama and I'm not about that, meanwhile this drama is a light romcom with some action. I just finished all 24 episodes, they're a short 30 minutes each.
The time travel plot was pretty solid and unique (and no, I don't get tired of this genre unless executed poorly) and the story moved along at a great pace where I never felt the need to hit the skip button. I loved that there was minimal court politics and instead they focused more on the cute romance between the leads.
The main male lead was perfect, like I would marry him right now hands down no objections. The main female lead was a little ehhh in the beginning, but she grew on me. She went from "you're slightly annoying?" to "you are funny, i like you" in a few episodes.
The OST is amazing- fits the mood of the drama. I can listen to it for hours.
Overall, great story, great chem, great costumes, great scenery, great music, i would def rewatch the scenes with the main couples.