The trio of Soo Jin Yang, Mina Jeong and Min ji Choi were simply too fast for the defending champions Hungary with a time 3:05.96, with Great Britain coming in 3rd.
"We love just swimming 100m" said the Koreans. "We all supported each other alot which we think helped us go a bit further. We now need to focus on the ride."
Korea’s commanding performances in the 1st 2 events means that sit on top of the leaders board 88 points ahead of Germany, who’s 5th place, was enough to keep them in 2nd.
The big movers after the swim is Hungary who move from 7th into 3rd and are back in contention to defend their World Championships title won in Moscow last year.