In October 2017, Ryujin auditioned for survival reality show MIXNINE. Having passed the audition, she made to the number 1 ranking of girls' team it until the final episode, but was eliminated when the boys' team won against the girls', and hence ultimately did not get to debut.
On January 20, she was revealed, along with her fellow members, as a member of ITZY, JYP Entertainment's newest girl group. They debuted on February 12.
- She is roommates with Yeji.
- She has two cats, Byul and Dal.
- Her favorites food are the spicy and savory ones. She also likes mocha bread.
- Her hobbies are watching movies and taking picture. Her favorite movie is "The Perks of Being a Wallflower".