Kim, and teammates Kim Hye-rin, Yang and Kim Su-jin represented Korea at the 2017 World Junior Curling Championships. The team posted a 5–4 round robin record, tied with Switzerland for fourth. They would beat the Swiss in a tiebreaker, before losing two straight games against Canada to finish in fourth place. This same team represented Korea at the 2018 World Junior Curling Championships. There, Kim led the team to a 4–5 record, missing the playoffs.