The Flowers Filled the Palace and Missed the Time (2017)

basically it's the same story. they changed the Dynasty into a Ming-like and instead of the imperial family you have the emperor's brother's family (kind of interesting, we never see a prince in his fiefdom)

Both dramas have main girl hiding identity from main guy. In both second lead characters try to get to top. The main girl in both are thought as weak in beginning.

Both dramas are set at the time of the Nine Lords' War.
Both dramas show the princes' endless scheming against each other to secure their position/reputation as a worthy crown prince/emperor to their father.
The female leads in both dramas eventually gets involved with politics and the princes - though with which prince differed between the two.
Both showcased aspects of arranged marriages, as well as marriage alliance.

Both dramas are set at the time of the Nine Lords' War.
Both dramas show the princes' endless scheming against each other to secure their position/reputation as a worthy crown prince/emperor to their father.
The female leads in both dramas eventually gets involved with politics and the princes - though with which prince differed between the two.
Both showcased aspects of arranged marriages, as well as marriage alliance.

Both dramas are set at the time of the Nine Lords' War.
Both dramas show the princes' endless scheming against each other to secure their position/reputation as a worthy crown prince/emperor to their father.
The female leads in both dramas eventually gets involved with politics and the princes - though with which prince differed between the two.
Both showcased aspects of arranged marriages, as well as marriage alliance.