Both are historical dramas from the POV of the servant class, with tall and strong MLs and an initially spoiled and headstrong FL who has character growth.

Both FLs are sold as slaves/servants and fall into a completely different status in which they must learn how to survive and navigate. Both MLs are mysterious, quiet, and stoic guards and killers who have hidden secrets.

The backstory of GFB is quite similar to Maids, in that a spoiled nobleman loses status, suffers, and is forced to become a servant, causing her to become involved with a quiet, mysterious man.

Both dramas have parallel stories with a star-crossed couple in the Republican Era and a couple in the modern day who are reading their story, with the same actors playing both couples.

Both are mystery dramas with a Republican era setting in which a trio of two MLs and a FL are trying to catch a murderer.

Both FLs are a modern day man who fall into the water and find themselves in a woman's body in historical times.

Both FLs are a modern day man who fall into the water and find themselves in a woman's body in historical times.

Both are historical dramas with a unique atmosphere, beautiful aesthetics, and bromance. Both are mystery dramas.

Both MLs get pregnant and give birth (one supernaturally, the other more realistically). Both FLs are strong and hard-working.

While very different plots, both explore gender roles in a semi-futuristic society in which some event (male pregnancy vs. almost no males) has occurred. Both are offbeat dramas with a heartwarming vibe.

Both are mini dramas in which the leads are both transported from modern day into a fictional historical world where one of them is assigned to kill the other. Both MLs are geeky and soft forced into a villainous role, FLs are strong.

Both are Republican Era mini dramas in which the leads are seemingly on opposite sides with the same goal.