Kathy novak in seoul with the latest. what do we know, kathy? >> reporter: we've seen pictures of won-moon joo being handed over. he was returned in line with a humanitarian gesture and adding that he had illegally crossed into north korea from china back in april. it seems from these pictures that he looks like he is healthy but south korean authorities will have their own questions not only about what happened to him in those six months or so that he was in north korea but also what he was thinking doing there. he is a south korean citizen, even though he's a u.s. green card holder and south...