After Sunday's match ended 1-1, the South Korea international rekindled memories of the 2002 World Cup, when his penalty block against Spain helped the co-hosts reach the semi-finals, by saving two spot-kicks in a shootout Suwon won 4-2.
Suwon coach Cha Bu-keun said a burning desire to play in next season's AFC Champions League (ACL) had driven his team.
"It was a tough match and I want to thank all the players for a good show," Cha told the Asian Football Confederation's website. "We really wanted to play in the ACL next year because we did not do very well this year."
Dzenan Radonocic put Seongnam ahead in the 26th minute but Brazilian Edu kept Suwon alive with an 87th minute penalty and the match remained locked at 1-1 after extra-time.
Lee saved shots from Kim Sung-hwan and Jeon Kwang-jin after Tiago missed for Suwon.
"I saw Pohang's win in the ACL (final on Saturday) and I must say I envy them. But it also tells us a lot of things," Cha said.
"As a coach, to be number one in Asia, number one in the world, is a goal."
