One
Due to negligence, the Uchiha family lost a little cub. In Sasuke's impression, when he was a child, he had a dull, cute younger brother. Their clan lost him. After the clan was massacred, he found this younger brother and became his spiritual support. In Itachi's impression, he had a dull, cute younger brother when he was a child. He lost him. After defecting, finding this younger brother became his spiritual support.
Two
Please call me Uchiha, Boromi, a homecoming machine with no feelings, a mutated social talent in the ethnic group, Li Feng
This person said so.
Three
This is a journey to another world for a little Uchiha kid. All the journey is just to return to his home. The cp has not yet been determined~ Everyone is welcome to come and see (~-△-)~
Ah, I'm such a lousy copywriter.