@Rin it's extremely hard to understand what you wrote.
You want.....
-A manga where the FL is blonde and a transmigrator
-She is married to the Duke of the North (is she already married when she arrived in the world or marries after arriving?)
-ML was in love with the original FL at some point (is she the one ML was supposed to love before the FL arrived?)
-FL and original FL get kindap but ML only saves the original FL?
-I don't understand what "plot is after the novel" means... does that mean the manga starts after the original novel passed?
Is that what you tried to write?
You want.....
-A manga where the FL is blonde and a transmigrator
-She is married to the Duke of the North (is she already married when she arrived in the world or marries after arriving?)
-ML was in love with the original FL at some point (is she the one ML was supposed to love before the FL arrived?)
-FL and original FL get kindap but ML only saves the original FL?
-I don't understand what "plot is after the novel" means... does that mean the manga starts after the original novel passed?
Is that what you tried to write?
..