Demetri Noh is Mark's partner with the FBI.
Noh is one of the younger agents in the Field Office, as his youthful exuberance can be a problem; it often causes him to jump to conclusions before gathering all of the facts.
There is one area where Demetri is forced into methodical thinking, however: wedding planning with fiancée Zoey. The reason? Noh has to ensure that she never discovers his secret.