They killed your brother it's make you feel the darkness form in your heart feeling nothing and only emptiness after your friends Neji, Ten-ten, Shino, Lee, Temari, Shikamaru, Hinata, Kiba, Choji, Sakura, Sasuke, Naruto, Ino and sai took the life of your little brother after that tragic events in your life you changed a lot being the coldest person and so distant from everyone and you left the village and come back after 10 years with the Akatsuki group and become one of them as you were ready