well if he gets US citizenship, I believe he has to drop the Korean citizenship. Dual citizenship is allowed up to age 18 but after that they have to choose. I have a lot of Korean friends who grew up here who has dual citizenship but had to choose at age 18. So if this lucky guy gets citizenship he would have to drop it and as American citizen the Korean government wouldn't be able to draft him. If it was green card or anything else Korean government would seize him at the airport the moment he arrives in Korea and take him to the army. Oh gosh how I would take that opportunity to serve in the army... for citizenship.