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.
My classified mission was indeed
the assassination of Sasuke...
كانت مهمّتي السّرّيّة
.هي اغتيال ساسكي بالفعل
Sicherlich war es meine
Geheimmission, Sasuke zu töten.
Así es, mi misión clasificada era 
la aniquilación de Sasuke-kun...
Así es, mi misión clasificada era la aniquilación de Sasuke-kun.
In effetti la mia missione segreta era di ucciderlo.
Minha missão secreta realmente
era assassinar o Sasuke...
Да, целью моей секретной миссии
 было убийство Саскэ...