As the intruder was caught at the first line of security i somehow doubt if this counts as a breach of security but more as a success. Early news reports described the man as "a foreigner" so maybe we should really be worried !? One would also suppose that it was a member of the security forces who made the description.
seems to have got over a fence he shouldn't have, so security isn't perfect; but he was grabbed after that. His name is Byung Jin Lee, though that of itself doesn't make him a foreigner.