
So the only thing that really changes about him as a person when he gains memories of his past life is that he learns familial love. He had a wonderful family and a little sister he adored, plus the fact that when he played the game he felt kind of bad for Julieta. So he regains his memories, and he learns to love his daughter who was previously nothing but a tool to him. Other than that, he is exactly the same person he has always been. He’s in his forties. Forty years of his awful personality and behavior, it’s kind of a miracle that even that much changed about him.

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He is did use his daughter for the revenge against the prince and his fiancee, but rather than 'use' per SE, they have become an accomplice (together with mallachia). That's a more equal relationship than before he regained his original memory
For the end of the volume. There's a cure for the curse, (that killed their family when they reached age 55) but only one person can have it. He gave the cure to his daughter.
Novel readers, may I know why mc is being evil? If it's to escape from being executed, does he have to go through all these? Or is he just doing it for revenge? How about his past life personality? Does it not influence his moral compass? Spoiler is grealy welcomed.