Tottenham Hotspur forward Son Heung-min's first-half header earned South Korea victory over Cameroon in a friendly in Seoul on Tuesday.
The 30-year-old nodded home a rebound in the 35th minute after Kim Jin-Su's strike was parried by Indomitable Lions keeper Andre Onana.
The Central African nation, who fell 2-0 to Uzbekistan on Friday, have now suffered two defeats in their final warm-ups prior to naming their World Cup squad.
Coach Rigobert Song named a strong side against the Asians in the South Korean capital, but Nicolas Moumi Ngamaleu's ambitious long-range effort was just wide midway through the first half.