[2] On December 28, 2018, she made her official debut with the single, "Let Me Out".

[3] Hynn first garnered attention when her song "The Lonely Bloom Stands Alone", released on March 31, 2019, had surged to the top 10 of various major real-time music charts six months after its release.

[4][5] Hynn participated in MBC's King of Mask Singer in 2020, where she was crowned the Mask King once, and is currently the youngest female participant in the show's history to have been crowned the Mask King, at 22 years old.

[6] She is also part of the seasonal South Korean all-female supergroup WSG Wannabe, which was formed through MBC variety show Hangout with Yoo.

[7] Under the supergroup, she became a member of the sub-unit Gaya-G, and with the song "At The Moment", she scored her first music show win in Show!