In 2017, Pledis announced Yewon, under the stage name Yehana, as a member of PRISTIN, which debuted on March 21, 2017 with the mini album Hi! PRISTIN and its title track, "Wee Woo".
On May 24, 2019, it was announced by Pledis that PRISTIN was officially disbanding after almost two years without activity. It was also announced that 7 out of 10 members had not renewed their contracts with the agency. Yehana was one of the only members to remain in the agency.