Seo was a male security guard assigned to the USS Enterprise-E, and a frontline veteran of the Dominion War. When the Enterprise was at Tezwa in 2379 to assist in the aid and rebuilding process, Seo had been one of the first personnel to serve on the surface; he later described in a haunted monotone with nauseatingly vivid details of a guerilla ambush in Anara-Zel that killed four security officers from the USS Republic to Fiona McEwan. (TNG novel: A Time to Heal)