He is his senior brother, whom he has been attached to since childhood.
He said to him: "I am your senior brother."
"So what! All I want is you!"
They don't care about human relations, they don't care whether they are men or women, they don't care about life or death, they only care about each other. One is good and the other is evil. They play an equally important role in the world, but they are also deeply affectionate. From love to hate, from hate to love, they are bound by life and death.