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Istg i read a story exactly like this like i know it has a lot of cliche but this other manga that i read it legit has the exact plot the duke adopting 2 of the children of his dead brother the duke was a war hero the fl has a shitty sister who tries to harm her i can't remember the title of that story it was like duke or something the only difference is in that story the fl marries into the family and in this she gets hired that's all rest everything is same and even the sister in that manga looks exactly like the sister in this one