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Kim Se-jeong finished in second place in the Mnet reality competition Produce 101, which aired in 2016. The show featured 101 female trainees from various entertainment agencies who competed for a spot in a girl group formed by the show's producers. Se-jeong was a contestant from Jellyfish Entertainment, and she was one of the most popular trainees throughout the show. She eventually finished in second place, behind winner Jeon So-mi.