- Was introduced in CUBE TREE on September 9, 2017.
- Learned Jazz Dance ever since she was little because her mom told her so.
- Soojin took Jazz Dance classes.
- Soojin used to do Taekwondo.
- Soojin’s father didn’t want her to become an idol but she begged him for 2 years.
- Soojin studied at Korean Arts High School.
- Soojin was casted when she was in third year.
- She became a trainee on 2016.
- Soojin was the fox girl that appeared in Soyeon’s ‘Jelly’ MV and ‘Idle Song’ MV.
- Soojin was to debut with the girl group "VIVIDIVA" (debuted 2015, disbanded 2016), but she left prior to their debut. She even performed once with them. Her stage name was "N.NA".
- Audition piece: Boa’s No.1 song
- According to Miyeon, she's sexy on stage but cute off-stage.
- According to Minnie, she's the mom-like younger sis, good at make-up, and good at singing.
- According to Soyeon, she's good at cooking.
- According to Yuqi, she's the one who puts Yuqi's eyebrows/Yuqi's stylist and good at taking care.
- According to Shuhua, she has a great body figure.
- Shuhua and Soojin are roommates.
- Introduced herself as the “Pretty Spring girl”.
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