The Rise of Ning

Female leads believe they are siblings with the male leads. Male leads secretly know they're not really related and fall for them romantically. Female leads eventually reciprocate their feelings.

Female leads believe they are siblings with the male leads. Male leads secretly know they're not really related and fall for them romantically. Female leads eventually reciprocate their feelings.

FLs story more on the family side while MLs dealing with palace politics
Both FLs are smart and don't like to rely on others
Jealous family always have scheme to bring FLs down
MLs become FLs closest confidant and always help FLs behind the scene
MLs have secret identities
Romance only blossom on the latter part of the story