Following the 1-1 draw last Wednesday in the first leg, Suwon won in front of their own fans to take the tie 3-2 and the trophy for the first time since 2004.
Despite sub-freezing temperatures and the snow that fell in the second half, over 41,000 fans created a red-hot atmosphere at Suwon’s Big Bird Stadium.
The majority of those supporters were celebrating after 11 minutes as Brazilian striker Edu fired home a low shot from the left corner of the penalty area.
The hosts’ advantage lasted for just 14 minutes as Suwon shotstopper Lee Woon-jae fouled Lee Chung-yung in the area and Jung Jo-gook stroked the ball home from the spot.
Nine minutes before the break however, Suwon were back in front.
Kim Chi-kon brought down Edu in the area and although Seoul goalkeeper Kim Ho-jun saved Song Chung-guk’s kick but the former Feyenoord man fired home the rebound.
Lee Chung-yung went close for Seoul in the second half but the capital club were unable to get back on level terms.
In the end, as the snow fell on the terraces, it was Suwon who celebrated.