In 98 AG, Sung and his wife had a son named Guri who was born. Shortly before Yu Dao's inaugural celebration, Sung was tasked by Fire Lord Zuko to lead the investigation of Tom-Tom's abduction and was present in the Fire Nation Royal Palace alongside Zuko, Mai, and Kei Lo when Avatar Aang arrived to offer his assistance. He bowed to the young Avatar as a sign of respect and promptly informed him about several sightings of dark spirits in the Fire Nation Capital, noting that Tom-Tom was the only child reported missing.