The shooters trained in the capital prior to leaving for the tournament, to be played in accordance with the new ISSF rules.
There will be major change in the scoring format as the scores of the qualification round won't be carried into the final round.
The finals will be feature elimination and will end with contests between the two best shooters to decide the gold and silver medals.
London Olympics silver medallist Kumar will compete in his pet event, the men's 25m Rapid Fire Pistol.
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Currently, ranked number 2 in his event, a good outing will see Kumar reach the numero uno position.
"I have been aiming to reach the number position. I have always maintained that this year's World Cups will give me the chance to reach there. I will give my level best there (Changwon). The camp in Delhi has been very good and we all are confident of a good show," Kumar said.
London Games bronze medallist Gagan Narang has decided to skip the event.