Be Happy, My Family, with the Fake

I was the Duke's real daughter, and the villainess I thought was my friend secretly stole my memories and evidence to usurp my place. I can still remember the triumphant smile on my friend's lips as she cast me out, having outlived my usefulness. "...It's for your own good. Since there are people in the Duke's family who know your face, it'll be troublesome for you if unnecessary quarrels arise, right? Just wait a little. I, as the Duchess, won't forget you and will prepare something good for you." Back then, I mistakenly believed that my friend was genuinely looking out for me, but that day was the day I died. Having realized the whole truth and returned to the past from death, I notice...