The Reincarnated Assassin is a Swordsman Genius

My previous life was a dog tied to a leash. I couldn’t even remember my parents’ faces, and I lived a life like a tool without emotions. That life ended with me being brutally murdered by my master. I thought that was how my life ended. But when I opened my eyes again, I was born as the youngest of the strongest family on the continent. Now, for revenge, and for those who cared for me in my new life, I will take up a sword instead of a dagger.