Pledge of Allegiance is similar to Strange Tales of Tang Dynasty because they both have the same themes: wuxia, historical, suspense, with hints of romance
both have a focus on brotherhood
both have mysteries from the previous generation
and current war/revolting groups
both include a little bit of romance
both have dark aesthetics
Similarities:
-Both are plot heavy.
-Both leads are weary of each other at first.
-Lots of conspiracies and palace politics in both.
-Comedy and romance do make appearances.
-Both have mysteries to solve and involve the Embroidered Uniform Guards.
Both dramas are historical detective dramas
Both dramas are about friendship between two male leads
Both dramas are investigative wuxia dramas
Both dramas are bromance dramas
Both dramas depict the same period of time in history.
Pledge of Allegiance comes from the pov of an imperial police while The Imperial Age covers the pov of Zhu Di (the dude who ends up with the throne in the end).
They are both conspiracy heavy historical suspense dramas. They also have a revenge theme. Both are set during the Ming Dynasty. Pledge of Allegiance takes place in early Ming and The Ingenious One in mid/late Ming.