Gim played as lead in her first world championship at the 2011 Capital One World Women's Curling Championship along with skip Kim Ji-sun. The team struggled finishing in last place with a 2–9 record. At the 2012 World Women's Curling Championship, South Korea made history by making the playoffs for the first time with a 8–3 record. They defeated Canada to advance to the semifinal, but lost a close game against eventual champions Switzerland. They then lost another close game to the Canadians in the bronze medal game, finishing in fourth place. Their fourth-place finish ensured them a spot in the 2014 Winter Olympics, even though South Korea did not qualify for the 2013 World Championships. At the Olympics, Gim played in the third and fourth positions, and the Korean team finished in eighth place with a 3–6 record. A month after the Olympics, Gim and her team represented South Korea at the 2014 World Women's Curling Championship in Saint John, New Brunswick. Like in 2012, the team had a successful run finishing round robin play with an 8–3 record and winning the tiebreaker 7–5 over Sweden's Margaretha Sigfridsson to qualify for the playoffs. They defeated Russia's Anna Sidorova in the 3 vs. 4 game but then lost the semifinal to, once again, Switzerland who went on to win the event. Gim missed her final shot of the Bronze medal game and the Russian's stole the win 7–6.