First I want to recommend you to watch; Love Like the Galaxy; Part 1, otherwise part 2 doesn't make sense.
* Both FL's have to struggle through their childhood with a bullying family
* Both FL's are quiet but clever and finally smart-out this family
* Both FL's are clueless about what being in-love really means
* Both FL's almost marry the 2th lead
* Both FL's stand by their partner no matter what
* Both ML's are cunning and make it to the top through merits of war

TSoML is more cunning and scholarly driven and more focused on the women within the society
LLtG is more scheming and revenge driven about something that happened long ago and still has a great impact on society

They are both fantastic productions and well acted

In the first episode it has already the same vibe, as in how it's filmed, ect..
> Both ML's are "marked" as criminals by governmental law enforcements.
> Starting to work for the government, in the meanwhile proving that the are not guilty of all charges.
> Both dramas have almost the same complicated departments working for and under the direct Majesty's command
> Working on a tight time schedule
> It's written by the same writer Qing Mei