On on August 22, 2017, Ji Won was revealed as a member of the then-upcoming FNC Entertainment's eleven-member girl group, however the group debut was put on hold.
2018–2019: Cherry Bullet
Later on November 20, 2018, FNC Entertainment revealed a teaser for their newest ten-member girl group, Cherry Bullet. Ji Won was among the first three revealed members on October 22, 2018. She officially debut with the girl group on January 21, 2019 with their debut single album "Let's Play Cherry Bullet".