Both stories are about two male leads who are CEOs and how they become CEOs with the help of two female leads who are very similar, style-wise. Both male leads have health problems and they both go through hardships because of their families and companies. Both have gone through some bad things as kids and in both dramas the two leads are related since childhood. They hate each other at first but change witht he help of one another. Both dramas are funny and in both dramas there are antagonists who try to create problems inside the company. Overall, the feeling is kind of the same!

I know they're different genres since one revolves around war and the other about the injustices slaves go through, but there are A LOT of similarities.

-Both female leads start off as lowly maids even if they weren't originally and were actually part of a higher class (in Maids she loses her status and in PA she loses her memory).
-Both female leads fight for justice and especially for the rights of the poor.
-They are both alone against the whole world basically.
-A cold male lead that hardly ever smiles.
-Romance that is important but isn't, however, the main focus.
-Female lead falls in love with the second male lead and hates the male lead at first.
-Good second male lead that becomes evil and corrupted towards the end but he still loves the female lead.
-In both dramas there's a depiction of the lives of maids and slaves who are treated badly because of the powerful nobles.
-Female lead is strong and isn't crazy in love with anyone.
-Second female lead is a noble in Maids and a Princess in PA and is in love with the second male lead.
-Delusional second female lead who was once nice but became evil, trying to make the female lead's life a hell bc of her love for the second male lead.
-Awful noble people are present in both.
-Once the female lead begins to trust the male lead, she discovers something that makes her lose her trust in him.