It is revealed later that Sasuke is the sole survivor of the once-powerful Uchiha clan of Konohagakure. He, at the age of seven, survived the massacre of his clan perpetrated by his brother, Itachi, who spared Sasuke's life because he did not consider him worth killing.
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My name is Sasuke Uchiha. I hate a lot of things, and I don't particularly like anything. What I have is not a dream, because I will make it a reality. I'm going to restore my clan, and destroy
Sasuke Uchiha