2017: Pre-debut In 2017, Ryujin appeared on the reality competition
MixNine. In the same year, she appeared alongside Yuna in
BTS's "Love Yourself" highlight reel and made a brief appearance in the political crime drama film
The King. In November 2021, she was selected as
Studio Choom's "Artist of the Month" and performed a solo dance cover of
Billie Eilish's "Therefore I am". In June 2022, Ryujin and fellow member Yeji performed
Bebe Rexha's "Break My Heart Myself" in Studio Choom's "Mix & Max" series. In April 2023, she released a video covering "Every Second" by Mina Okabe. On December 22, she released the music video for "Run Away", her solo track from Itzy's eighth EP
Born To Be. In September 2024, she released a cover of
The Smiths' "There Is a Light That Never Goes Out", followed by a cover of
The Carpenters' "(They Long to Be) Close to You" in February 2025. On November 6, it was announced that Ryujin had been cast as Kang in the upcoming film
Night on Earth. ==Other ventures==