Team Kakashi are stunned to learn that Sai's true mission is to kill Sasuke.  Naruto wants to believe that the smile Sai showed them was real, but there is a possibility that it was all an act.
Smiled from the bottom of his heart.
.ابتسم من أعماق قلبه
Sonrió desde el fondo de su corazón.
Lo hizo de corazón.
Gli veniva dal cuore.
Sorriu do fundo do coração.
Искренне.