Concept photo for
Oh My God
Seo Soo-jin (서수진)
(younger sister) Soojin
(Korean: 수진; Japanese: スジン; formerly known as
) is a South Korean singer currently under
. She is a member of the girl group
and was a pre-debut member of
Using the stage name
N.Na, Soojin was part of the pre-debut lineup for the girl group VIVIDIVA. However, she left the company before the group could debut.
2017: Cube Tree
On September 9, 2017, Soojin was introduced as a
Cube Entertainment trainee through the trainee group Cube Tree.
2018: Debut with (G)I-DLE
On April 10, 2018, she was revealed as the fourth member of
(G)I-DLE. The group officially debuted on May 2 with their first mini album  .
Following the surfacing of photos of Soojin on a date with
PENTAGON's Hui, on August 2, 2018, Cube Entertainment confirmed the pair had dated in the past but was already broken up.
Music video appearances
She knows how to dance jazz, she learned at a young age.
 Soojin decided early on she wanted to pursue a career in singing, however, it took two years for her to recieved her father's support.
 She attended a dance academy, which helped her to improve her dancing skills, and later attended a vocal academy to learn how to improve her singing.
 Soojin practiced taekwondo.
 Offstage, she has a cute and shy demeanor.
 In Soyeon's music videos, she was the fox girl. 
 Soojin auditioned for Cube Entertainment by singing BoA's "No.1"
 In , she was a part of the Six Puzzle unit, along with Queendom Moon Byul, YooA, Jeong Ye In, Chanmi, and Eunji.
 She has many tattoos.