"Untitled" (無題, Mudai) is chapter 287 of the original Naruto manga.
Sakura finds Sai drawing a picture. Impressed by his talent she asks what he is going to call it. He cannot come up with anything, his lack of emotion making it impossible for him to be so creative. She finds a picture book he drew amongst his belongings, which he says belongs to his brother. When Naruto appears Sai insults him again while keeping a fake smile on his face, something he does for others' benefit so that he has the appearance of emotion. Later that night Yamato asks Sakura to tell him about Sasori, as they must be able to approach his spy without raising suspicion.