Adin knew that he was the one who must fill the medallions in the belt.
Jonn is in need of more information! Jonn is lacking a complete synopsis with a detailed history. The section about his role in Rowan of Rin also need more a lot more details.
Jonn was best friends with Sefton, Jiller, Marlie and Allun. He was devastated when Sefton was killed in a house-fire while saving Rowan.
He eventually developed feelings for Sefton's widow and Rowan's mother, Jiller. His feelings were later reciprocated by the time of the events in Rowan and the Zebak.
Rowan of Rin[]
Jonn is one of those who goes up the Mountain to restore the stream to Rin. It is plain from the beginning that he is in love with Rowan's mother, and promises Jiller that he will bring Rowan home safely to her no matter what happens.