The Indian pair did not even need its A game in trouncing the visitors 6-3 6-4-6-4 in just one hour and 41 minutes at the grass courts of Chandigarh Club.
Saketh Myneni and Ramkumar Ramanathan had won their respective singles yesterday to hand India a 2-0 cushion.
The reluctant partners for the Rio Olympics did not face any competition from the Koreans in what is their only competitive match together before the Games.
Teaming up for the fifth time at the Davis Cup, it was their third win. Before this they had won against Serbia (2014) and Kazakhstan (2007) and lost to Uzbekistan (2012) and Czech Republic (2015).
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Captain Anand Amritraj would be delighted to see that his idea of playing on the grass worked for his side.
India's rivals in the World Group Play-offs in September will be either China or Uzbekistan, who led 2-1 at the end of day two of their tie.
Since the rain stayed away yesterday and this morning, the court played much better today, offering good bounce.
Sending down two double faults in the opening game was the only blemish for Bopanna, who kept tormenting Chung and Hong with his booming serves in the range of 200kms\hour throughout the match. He fired nine out of the 12 aces that India hit today.
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In the first set the Indians took lead when they broke Hong in the eighth game. Paes found a volley winner to earn two chances for the side and Bopanna finished it with another winner.
Bopanna served out the set in the next, finishing it with an ace, his sixth. They broke Hong in the third game of the second set when Paes ran to his left and made return and the Koreans failed to pick up the low volley.
Ramkumar seized the moment with a forehand winner, as Lopez watched the ball pass him. The crowd was at its feet, with the applause lasting several seconds. Ramkumar served out the set in the next. Ramkumar had won a little battle and the fans had much to celebrate.
Lopez though immediately snatched back the momentum by breaking Ramkumar in the second game of the fourth set, rushing to a 3-0 lead.
In no time, the fourth set ended after that break.
In the second match, Ferrer played with good intensity, sprinting with the first set in 21 minutes.
A blistering forehand by Ferrer meant that Myneni was again down a breakpoint in the sixth game. He saved the first but double-faulted on the second. The set was over in a jiffy.
Ferrer continued with his dominating game, getting the break in the first game of the second set as Myneni sent a backhand out. Ferrer zoomed to a 5-0 lead.
The Indian got one break back but Ferrer sealed the set in the eighth game.