On July 7, 2016, So-hee debuted as a member of CIVA, a project girl group formed in the Mnet mockumentary show The God of Music 2, with a remake of "Why?"

[1][2] On August 18, 2016, So-hee became part of another project girl group, IBI, which consists of eliminated contestants from Produce 101 (season 1) and was managed by Kakao M (formerly LOEN Entertainment).

[3][4] On April 10, 2017, it was announced that So-hee was one of the cast members in KBS TV reality show Idol Drama Operation Team.

On November 8, 2017, during the interview of the showcase for her mini album The Fillette, So-hee described her admiration for senior female solo artist IU.

She continued, "I want to emulate her innocence, look in her eyes, singing abilities, and steady vocals even when she's dancing on stage.