BBC has a very cler (as mud) explanation of the possibilities for Korea to move on.
A draw with South Korea will be sufficient for Switzerland to progress to the second round.
If France fail to beat Togo, both Switzerland and South Korea qualify for the last 16. If France beat Togo by at least two goals and South Korea do not beat Switzerland, the Koreans are eliminated. If France beat Togo by a one goal margin and South Korea draw with Switzerland, the tiebreaker 'goals scored' becomes decisive for France and South Korea.