South Korea, who have qualified for a ninth successive World Cup finals, looked comfortable as they dominated possession but their lead lasted only 13 minutes.
Jamie Ward played a dangerous low ball into the area and Kim Min-jae turned the ball past his own goalkeeper.
Chances were few and far between in the second period but Queens Park Rangers striker Smyth produced a memorable moment to fire a shot low into the corner with virtually his first touch.
Michael O'Neill's Northern Ireland missed out on qualifying for the World Cup when they were beaten by Switzerland in a two-legged playoff in November.
(Reporting by Martyn Herman; Editing by Toby Davis)
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