She debuted as a member of BONUSbaby on January 1, 2017 with the group's first single "Urikiri". On September 9, 2018, it was announced that Kongyoo would be leaving the group to focus on her studies. In a 2019 interview with The Korea Times, Kongyoo, now known as Kong Yoojin, revealed the reasons for her departure from BONUSbaby.
While she did not directly address the issue, she described her time under the company as painful, mentioning that she suffered from vocal cord damage and cervical disk pain due to the company's demands. She also noted that she was graduating from university and expressed a desire to become a music teacher and vocal coach. After graduating in 2021, she began working as a vocal coach.
Sometime in 2022, she was introduced as the vocalist of the independent band AiDEN. On September 16, 2023, she debuted as a soloist under the stage name Buddy with her first digital single "깜빡이". On April 14, 2024, she released her second digital single, "Shine in the Empty Mind", this time under the stage name 067.
On December 7, 2024, she was introduced as the vocalist of the South Korean band GULP, this time performing under her real name, Kong Yoojin. In September 2025, she joined X909, an artist collective formed by musicians under her label, 909trillion, performing under her stage name 067. On October 1, she was identified as one of the contestants on the singing survival show Sing Again 4.
On December 16, in the 10th episode, she was eliminated and finished in the top 16.
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