The dramas have the same plot, the characters have the same names, and the events are quite similar.
A similar plot. In a past life, a maid becomes a concubine, but she and her child are killed. In this life, she will take revenge. In version "A maid's ... " the ml is more immoral, and the scenes are more explicit.
two versions of the same plot.
A poor relative lives in a rich house where she has an affair with an older cousin who is about to get married.
A poor relative lives in a rich house where she has an affair with an older cousin who is about to get married.