Ferrets love their younger brother Sasuke. In Sasuke's childhood memory, ferret has always been a gentle, excellent and loving brother. In order to protect the village, the ferret chose to exterminate the nation. Only Sasuke could not do it anyway. He said to Sasuke, "No matter how you go, I will always love you deeply."
Extended data:
Battle of Neiguang Brothers:
After Sasuke killed orochimaru, he formed the Eagle Team to kill Uchiha Itachi. When he was seriously ill and was on the verge of death, the skunk agreed to Sasuke.
Three days later, he went to war with Sasuke. In the battle, the skunk didn't want to kill Sasuke. He had long thought about how Sasuke would deal with himself, just pretending to dig his eyes to get Sasuke out of orochimaru's spell.
Pushed Sasuke to the limit before he died. After Sasuke's killer Kirin was released, he successfully resisted this move. After Sasuke was exhausted, orochimaru in the body took the opportunity to occupy Sasuke's body.
Right in the heart of the weasel, he successfully blocked orochimaru with ten fists, and then burned the white snake in orochimaru with the sky. At this point, orochimaru died in this battle, but orochimaru's cells still exist. Then he smiled and nodded his brother's forehead, asking Sasuke for forgiveness for the last time.
He chose to bear everything and die at Sasuke's hand in order to atone for the Neiguang people who died in his own hands and safeguard the last reputation of the Neiguang family. The skunk not only set a seal in Sasuke's eyes to stop Uchiha Obito, but also died in front of Sasuke with a smile, which enabled Sasuke to open the kaleidoscope sharingan.