The lost soldier: ATLA fanfiction

Here is Sagi, young soldier from Water Tribe. Avatar Aang and his friends need help immidiately. They must stop rebelion in North Pole. Sagi is the most suitable person for this task. Will they discover the real cause of the rebellion? What about Sagi's feelings to Sokka? Moreover, this young man hides very dark secret which can't be known by anyone.