Great Britain curling skip Eve Muirhead insisted her rink would be better for the scare after edging past a determined Korea at the Winter Olympics in Sochi.
Muirhead, Vicki Adams, Claire Hamilton and Anna Sloan appeared always in control but gave up a steal for two in the ninth end.
But the world champion held her nerve, picking up a decisive three with the final stone of the final end to secure a 10-8 win.
And, following Sweden's defeat on an adjacent sheet, Great Britain are now joint second in the overall standings with four wins and two losses. Canada's Jennifer Jones won again to remain unbeaten.
"It was a game of two halves and they played really well," said Muirhead.
"We had a slack ninth end and gave up a steal of two but when you win like that it stamps down a marker. We played 100 percent on that last end and it's great to know we can play those ends under pressure.
"We showed lots of grit there and lots of teams would have put their heads down but we came back fighting.
"After the first couple of games we needed to keep winning, we've got the ball rolling and the momentum going."
Great Britain will play Switzerland later this evening with the experienced Mirjam Ott, a double Olympic silver medallist, looking to bounce back from successive defeats to Canada and Russia.
"We were in control for most of the game, until that ninth end," added Sloan.
"We stepped back, relaxed and didn't panic because we knew if we kept playing like we had been, we'd be okay.
"It was always going to be tough against the Koreans, who pretty much live full-time in Canada during the winter.
"It doesn't matter how you win as long as you do. We are building some momentum now and we are pleased with how we are playing and supporting each other. We're keeping our consistency levels up."
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