Kawaguchi Yurina

 (Kanji: 川口ゆりな; Hangul: 카와구치유리나) is a former member of X21 and a former contestant on MNET's girl group survival show, Girls Planet 999.

2016 - 2018: X21
She joined X21 in April 2016 as a 2nd generation member and was among the final lineup when the group eventually disbanded.

2021: Girls Planet 999
From August 6 to October 22 2021, she competed in the MNET girl group survival show Girls Planet 999. Throughout the show she ranked consistently in the TOP 9. Placing 1st on the first individual ranking in episode 5, 2nd on episode 8, 6th on episode 11 and 14th on episode 12, where she did not make the cut for the debut group.

Singles

 * Natsu dayo!!
 * Kagami no Naka no Parallel Girl
 * Genjitsu kara Nigeru kara Genjitsu ga Tsurainda
 * Friday Night Party
 * Destiny

Digital Singles

 * O.O.O

Trivia

 * Her MBTI personality type is ESFJ.
 * Her hobbies are listening to music, watching anime and movies.
 * Her specialties are golf and playing the flute.
 * Her role model is TWICE.
 * She attended the same high school as fellow Girls Planet 999 contestant, Kubo Reina and was classmates with her.