Known for its controlled possession, South Korea dominated the first 20 minutes. Ghana broke through in the 24th when Salisu scored in a scramble in front of the net off a free kick. After a spirited celebration encircled by his teammates, Salisu nervously crouched on the field while the goal was confirmed by video review.
Kudus, a 22-year-old midfielder for Ajax, doubled the lead with a header off a long cross from Jordan Ayew, despite the desperate efforts of defender Kim Jin-su.
Cho did a knee slide in front of South Korea's bench and was dogpiled by his teammates after his first goal in the 58th minute. His second came in the 61st.
Ghana wraps up Group H on Friday against Uruguay, while the South Koreans play Portugal.