Kim's side face a Gamba side who also suffered an opening round defeat after visitors Guangzhou R&F of China pulled off the upset of the first round with a 2-0 victory in Japan.
"Both Seongnam and Gamba lost their opening matches, so we are both under pressure to win. But Seongnam is playing at home so we are confident about winning this match," said Kim.
"Gamba are a very good team and have won championships on the continent and in the J.League, so I have though a lot about how to combat them on the field.
"The players and I will do our best to make the K-League proud. We aim to win and show the power of the K-League clubs in this competition," he added.
Gamba coach Kenta Hasegawa believes the early continental setback will help the treble winners raise their game for their upcoming fixtures.
"The AFC Champions League has a high level of players and teams, so even though we lost, it doesn't mean we're not good, it just means we have to try harder," said Hasegawa.
"My team is doing their best in training for this match and although we lost our first game, we will win our second match," he added.