This similar to The Double in that the FL takes on the identity of the person who saves her.

She takes care of her saviors family and does what she can to enact revenge without revealing her true idenity

In both dramas there's a supportive ML who grow to know their secret identity and still love them anyway

The revenge is so sweet in both and both have very strong Fl who don't take bs and think steps ahead

The double definitely had a better ending than Princess of Wei Young, but both are formidable cdramas with strong a strong plot, characters, and sweet revenge.