Please help me find this

It’s a manwha where the fl transmigrated into a novel, her family was executed for treason(they were framed) by the og fl’s tyrant father and she was forced to become the og fls poison tester but then later became her maid after being poisoned.
For some extra info:
The male lead had black hair and has legitimate claim to the throne
The mc might have pink hair (I’m 90% sure)
The og fl becomes jealous that mc is getting praised for being a good maid
The og fl and mc get kidnapped and the og fl accidentally knocks mc out and when they get found the tyrant father only saves og fl
Og fl is a regressor
There’s a high ranking noble(i think he’s a duke or maybe a grand duke) who mc gets adopted by
Og fl keeps trying to be seen as all perfect
Ml got sent to the battlefield
Also they’re all kids from where I was
Mc also hates the tyrant and he also openly despises her (despite her being a literal kid)