Recommendations

Both are historical mystery/romance dramas with a slow burn love story between the couple. Both dramas have a similar lighter tone.

Both are light-hearted with some more serious moments, mystery/romance hybrid genres, and have an initially semi-antagonistic to frenemies to friends to lovers relationship between the main couple.

Mystery/romances with initially bickering/mismatched couple.
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Both are breezy historical mystery/romances with a bickering slow burn couple.
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Both are mystery/romances that start out with a bickering/semi-antagonistic main couple.
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Both are breezy mystery/romance with palace conspiracies/intrigue and a FL trying to clear the name of someone close to her (family vs. teacher).

Both are a blend of romance and mystery genres that lean more toward the mystery aspect at first but have a sweet and enjoyable couple who solve crimes together.

Both are lighter toned mystery/romance blends with a similar vibe and relationship between the main couple.

Both dramas are a hybrid of mystery and romance genres that first lean more to the mystery aspect. Both are breezy-paced plots with a slow burn love story.

Both dramas are a blend of mystery and romance with a initially brash-seeming inwardly marshmallow of a ML and a innocent FL.

Same time period, both covering the effects of war on civilians with an foreigner ML as the POV. Both dramas have a star-crossed romance, and a tragic ending with the ML surviving after the FL's sacrifice. Both have children as supporting characters.

Different setting and countries, but in both
-the two leads come from enemy countries, with the male lead’s country submitting the female lead’s
-for this reason, the female lead hates the male lead at first
-she also has a lover at the start of the series
-despite her hatred, the male lead is crazy in love with her
-but she eventually gets won over by his devotion

Koo Kum is much more tragic however. Prepare yourself for a River of tears here !

A man who rebels against an abusive and corrupted system by going against the law and uses a secret identity

- A male lead who starts off as a selfish man who only wants to survive and goes through a lot of changes, and eventually secretly involves through the resistance
- A female lead who despises him at first and is involved in a resistance movement
-It’s about the same timeline, but in different countries, with a rebellion happening
-The mâle lead and his sweet, innocent best friend eventually become enemies, notably due to their love for the same woman and a pledge of revenge from his best friend who turns into a psycho

The first two episodes of this drama (apart from the opening scene) had the exact same feeling and humour as Ancient Detective. You could place Wei Wuxian, his donkey, his flute, and his zombie inside Ancient Detective and they would be right at home there, minus the sorcery, that is.