Well, from what I've heard about similar light novels, in 'the real daughter is back light novel', it could be that the real daughter comes back to a family that has been deceived into believing someone else is their daughter. She might have to prove her identity and then face the emotional turmoil of a family that is in a state of shock and confusion. There could also be elements of revenge as she might want to take back what was stolen from her, like love, inheritance, or status.
I'm sorry I don't know the exact main characters as I haven't read the novel. But usually, there would be the real daughter herself. There might also be her family members, like her parents who may be deceived by the false daughter. And perhaps there could be a male lead who gets involved in the real daughter's journey of reclaiming her place.
A daughter-in-law manhwa often focuses on family dynamics and the relationship between the daughter-in-law and the rest of the family. It might have elements of drama, romance, and sometimes comedy.
It depends on your perspective. Some might think so, while others might have doubts based on various factors like the hero's actions and character development.
I don't have a definite answer. Maybe it'll come back when the storylines and art are ready for a new installment. Just stay tuned for any official announcements.