Kyung was born and raised in Amegakure during the 3rd great ninja war. He has a twin sister named min and lived in a two parent household. His father,Kaito Soo was Korean and his mother,Aoko Soo was Japanese. At the age of 7 both Kyung's parents were killed by jonin from Iwagakure. After this, Kyung and his sister went their seperate ways. After a while Kyung runs into Nagato Yahiko and Konan after wandering around asking people for food. Yahiko and Kyung as well as Konan immedialty become friends ((more like brothers and sister)) while Kyung to this day has a mutual respect for Nagato. The four soon head out to find someone to teach them ninjutsu,thus meeting Jiraiya. After training with him for 3 years Jiraiya leaves,leaving the 4 children to fend for themselves. Kyung joins the akatsuki