Never treat your mother that way, especially if she's trying to be supportive. This was a well-deserved punishment.
MC should hire that MOB mama as a full-time maid.
003 was the one who let 001/Ijin go free. I'm surprised she still hasn't figured out that Ijin is alive. Even after ONE gives her all the information, she still can't think that 001 is alive.
One is a monster among monsters; he would have been a terrible leader for the Numbers. They would have all tried to kill One, or One would have killed them.
Unless one of the members is a former Number who somehow escaped 003's slaughter, the Shadow Society seems like the perfect organization for a number to hide.