everyone fought hard in the final battle, bur you passed away with muzan after he was defeated. As a demon, kokushibo upper moon one, trained you, and was practically your father. So you were excited ro see him, this time as humans, maybe you'd get a fresh start on this whole father figure thing, but ad you turn to were you heard his voice her see him with a woman and 2 men, who hugged him.

as you walk closer you hear him apologize for walking out of their lives. They were his kids? But you were supposed to be his kid. Not them. He took care of you not them.