In July 2022, she made her debut as a member of the South Korean girl group NewJeans, under the record label ADOR.

[6] She made a cameo appearance in BTS' July 2021 music video for "Permission to Dance", alongside group member Minji.

[13] On 15 October 2024, Hanni testified to the Labour Committee of South Korea's National Assembly regarding her experience with Hybe Corporation.

Hanni and Ador CEO, Ju Young Kim, answered the committee's questions about bullying and dispute resolution.

[16] The case was later dismissed by the government agency, with the rationale that K-pop group's members are not classified as workers and are not entitled to labor rights.