You Xian was abandoned by his parents since birth because of his bloodline. He started wandering after the death of his adoptive mother at the age of four. He lost an eye to his friend at the age of eleven. At the age of thirteen, he was taken into a laboratory for human experiments because of his innate "talent"...
He is a child who has lived with all kinds of malice since childhood.
I have never been treated gently by anyone, so I have only learned to treat the world with malice.
At the age of twenty-three, he came to a certain dark honmaru and got along happily with the dark fallen swordsmen.