South Korea's former prime minister and acting president Han Duck-soo ended a short, ill-fated attempt to win the conservative party's presidential nomination on Sunday after days of internecine disputes just days out from the election.

South Korea's conservatives made another about-face on Saturday and reinstated their presidential nominee, Kim Moon-soo, just hours after dropping him.

Former Prime Minister Han Duck-soo said Wednesday he would make reforming South Korea's constitution his top priority if he is able to secure the candidacy of the conservative People Power Party and win the presidency.