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She was originally set to debut in the girl group 6mix.
She officially changed her name from "Yoo Jeong-yeon" in third grade because she was teased for her birth name "Yoo Kyung-wan", which was considered too boyish.
On her first try, she failed the JYP audition. She became a trainee after passing the JYP Entertainment’s 6th Open Audition on March 1, 2010.
The leader of Twice was decided by anonymous voting. Jeongyeon was in 2nd place.
The name Jeongyeon means 'virtuous' and 'beautiful' in Korean.
Her sister is actress Gong Seongyeon and they hosted Inkigayo together, and their father is a chef.
She is ambidextrous, but her left hand is dominant. She can throw and write with her right hand, while eaing food with her left.
She has 2 dogs: a white Pomeranian named Bbosongie and a poodle named Nanan.