Tunisia beat Korea Republic by a single goal on Wednesday in the final game for the Asians before they leave for the World Cup in Brazil.
Midfielder Zouhaier Dhaouadi netted the game's only goal late in the first half at Seoul World Cup Stadium, as the visitors handed Georges Leekens a victory on his debut as coach.
While Tunisia celebrated, this was not the send-off the Taeguk Warriors would have wanted as the 2002 semi-finalists set off for their eighth consecutive World Cup.
The goal-shy South Koreans, who will face Belgium, Algeria and Russia in Group H, travel to Miami on Friday where they will play another friendly against Ghana on 9 June.
After a cautious start, South Korean captain Koo Jacheol had the first dangerous attempt from outside the box in the 14th minute, but fired just wide of the right post.
The hosts were shading possession but were not able to threaten. Bayer Leverkusen's Son Heungmin got a sight of goal on the half-hour but his shot went straight at goalkeeper Farouk Ben Mustapha.
Tunisia came into the game late in the first half, with Wissem Yahya forcing South Korean 'keeper Jung Sungryong into a sharp save in the 42nd minute.
And the visitors broke the deadlock two minutes later, when Dhaouadi took the ball in midfield and sprinted virtually uncontested into the area before putting it past the diving Jung.
Korea Republic came out with more life after the break. On-loan Arsenal striker Park Chuyoung struck a low shot from the edge of the box, but Ben Mustapha parried.
And the home team found themselves frustrated by Tunisia, who put bodies behind the ball to make sure of holding on to their slim lead.
Second-half substitute Ha Daesung nearly equalised at the death, but his shot moments before the whistle skidded wide of the left post.