Recommendations

Both show how corrupt the government can be. Both have some crappy Prosecutors who only think of themselves. In Remember - War of the Son it deals with Alzheimer's and in Duel one of the characters has memory loss.

Both are crime dramas. Both are science-fiction. In Tunnel the main guy is looking for his kid. In Duel the main guy is searching for his missing daughter. However the two have completely different storylines. Tunnel has the time traveling aspect and Duel has the clone aspect.

> Another historical drama (WW2 era)
> Zanilia Zhao main lead
> Badass female lead
> Fights to win war (RAR) ~ whereas in PA she fights to get rid of slavery.

Same director using the same quirky style. However Memories of Matsuko has a much darker plot.

Empress Ki and Queen Insoo are both strong woman who are smart and cunning.

Akunin and Ikari have a sort of slow and sprawling dark narrative that feels quite similar. Both with an emphasis on human nature and paying close attention to the cinematography and music. If you like the one, you'll probably like the other.

Tsumabuki Satoshi is in both of these as well.

both have ghost romance(in "Bring it on,ghost" the lead fall in love with a ghost)
both have murder cases

Scholar Who Walks The Night and The Emperor: Owner of the mask have similarities. Both story is developing the crown prince to become a great King.

It's because there is a cruel person/vampire that stand behind the Kings order and the Prince were forced to serve that person/vampire in order to keep his people save.

In The Emperor: Owner of The Mask there is Daemok. In Scholar Who Walks The Night there is a vampire called Gwi.

If you like kind a dark romance, something that's not only black & white - sometimes grey, when the male/female lead is only human and can made mistake - everyone made mistake and try to correct it, something psychological, steamy, smut and mature story. I think you can give KNH a try.
NB: there is too much of adult content, recommended for 17+ only.

Both start with the same plot of a humanoid robot to be the partner (taking care) of the main guy.

Both series are about vampire it also has
Action
Doctor
And the romance is good
But most importantly the main is totally hot

Both involve bringing justice for the people, and involve a bit of romance. Personally, both of the weak points in both of these dramas are the romance.

The two dramas have different dynamics. Emperor: Owner of the Mask involves the people & the palace versus the Pyungsoo group. Rebel: Thief Who Stole the People involves the rebels and the palace.

Both place the focus onto the main character who develops into a true leader.

Both have two universes connecting. Circle is about aliens or seems to be and W was about a comic book dimension.

Both dramas explore the impact of the past on an individual. While MSR focuses a lot more on the romance between the two leads, the other is much more touching and heartfelt in its message.

These dramas are very different overall. But both delve into the issues which blind individuals face, and also familial bonds and such. While Hyung is more of a story of acceptance, having hope and forgiving yourself, and moving on in life, Blind is a story of realisation, suspense and closure.