ChaeYeon

On December 11, 2019, snippets of a video from the variety kids show Tok! Tok! Boni Hani went viral online and caused concern with scenes of alleged verbal and physical assault on Chaeyeon practiced by two seniors presenters.

Later that day, EBS stated the immediate dismissal of both presenters, and confirmed that they would be more restricted in such situations, as well as apologizing to the public. However, Chaeyeon's company released a statement wherein the member confirmed that it was all a joke between them. On August 6, 2020, Marbling announced Busters would be going on a hiatus and reorganize, with Chaeyeon, Jisoo, and Yeseo to finish group activities before focusing on acting and other broadcasting activities in the near future.

On July 21, 2021, she signed an exclusive contract with YK Media Plus. On May 23, 2022, the agency was deleted from her Naver profile, indicating her departure. On June 16, 2022, it was reported that Chaeyeon would be re-debuting as a member of the upcoming girl group tripleS.

On June 22, she was introduced as the group's fourth member. On September 25, 2022, it was announced that she has been placed in +(KR)ystal Eyes. tripleS debuted on February 13, 2023 with the mini album Assemble.

On April 23, 2023, it was announced that ChaeYeon has been placed in EVOLution. +(KR)ystal Eyes made their debut on May 4, 2023 with the mini album +(KR)ystal Eyes . On November 24, it was announced that ChaeYeon has been placed in Aria.

On August 27, 2024, it was announced that ChaeYeon had been placed in ∞!. On September 8, 2025, ChaeYeon was placed in Sun.