He is the third brother. He is enchanting and beautiful. He is called the "ghost-faced young master" by the world, but he protects her regardless of any fame, wealth or status.
She is a cold-blooded Shura, bathed in blood and killing and reborn, but she only treats one person docilely.
Later, she became the best in the world, arrogant among all the heroes, looking down on the world from a high position, no one was afraid of her, no one looked up to her, she was a god-like existence, but she was still willing to obey one person.
She fought and moved forward with her close friends who had lived through life and death, and finally reached the top.
He has always been with her and protected her, just because of a promise, a small promise made by a boy to a girl.