On May 5, 2015, she became a contestant on JYP's survival show, SIXTEEN. She finished the survival show in 2nd place, hence becoming a member of the girl group TWICE. The group officially debuted on October 20, 2015 with their first mini album The Story Begins.
The name Nayeon means 'elegant/graceful' and 'beautiful' in Korean.
She was originally set to debut in the girl group 6mix.
Instead of entering a cram school to study harder, Nayeon secretly attended JYP Entertainment's 7th Open Audition and became a trainee. She halted university studies during Sixteen, but is majoring in film studies.
Her left leg is weak due to a car accident when she was young.
According to the Korea Institute of Corporate Reputation, she was at the top of the May data in 2017. 31,424,347 pieces of data were examined from April 12 to May 13. Nayeon had a total of 864,556. This placed her as one of the most desirable female Korean Idols for commercial and modeling campaigns.
In Gallup Korea's annual music polls which interview 1,500 people between the ages 13–29, Nayeon was voted the 11th most popular idol in 2016, only behind Tzuyu, and the 6th in 2017 and 2018, ahead of all her bandmates.
She tried the MBTI test twice, her first MBTI was ESTP-A (Entrepreneur), but when she took it again, the personality changed to ISTP-A (Virtuoso)