The short answer , unfortunately, is a NO . Foreign Earned Income exclusion does not apply unless he meets the 330 days in a 12 month period. But if Korea taxed his income , then yes he could be eligible for foreign tax credit ( he has to make sure that the US earnings during the two/three month period -- that is taxed by Korea-- is sourced to Korea ). I am assuming here that his employer is an US entity and therefore his wages were paid as US sourced income.
Does this answer your question and/ or do you need more help ?
