South Korea almost struck back seven minutes later, when Jung Seolbin curled a shot from the left hand edge of the box but the ball crashed off the post and was cleared.
North Korea then broke the deadlock from the resultant free-kick around 25 yards out, when Yun Song-Mi’s effort took a deflection and flew into the net.
In the 20th minute, South Korean defender Lim Seonjoo was booked for holding back North Korean striker Ra Un-Sim, who was threatening to break through on goal.
North Korea goalkeeper Hong Myong-Hui narrowly avoided embarrassment in the 10th minute when she let a long range Jung Seolbin shot slip under her body, but recovered to stop the ball just before it crossed the line.
A draw was all that was required by North Korea to win the four-team, round robin tournament, but a deflected Yun Song-Mi free-kick and a Ra Un-Sim goal in the second half sealed the tournament with a victory.