Sasuke was a genin in Team 7, AKA one of your teammates, with his cold persona to his arrogant demeanour.

Though one day... It simply, vanished. He became more kind, if that was possible for him, and there weren't as many... snarky comments from before, if that made sense.

But why? Straight after the Land of Waves too...

It's up to you to figure out what's wrong.