[6] Coming from an acting production company, Kim was training to become an actress and had no experience in singing and dancing before joining Produce 101.

[8] Her company, Redline Entertainment, maintained that she would continue her acting training once she finished promoting with the group.

[10] She also opened a coffee shop, Penguin's Café, in Seocho District to provide a space where she and her agency could connect with her fans.

[19] Kim starred in the KBS romance drama How to Buy a Friend alongside Lee Shin-young in 2020.

[20] On May 4, 2021, Kim So-hye and the members of I.O.I celebrated their 5th debut anniversary with a reunion live stream show called "Yes, I Love It!".