Im Na-yeon (Hangul: 임나연) was born on September 22, 1995 (age 22) in Seoul, South Korea. She is the oldest member, lead vocalist and face of the group. Nayeon secretly tried out and passed JYP Entertainment's 7th Open Audition and became a trainee on September 15, 2010. In 2013, she was cast as a member of 6mix, a JYP girl group that was planned but never debuted. Prior to Sixteen and her debut as a member of Twice, she appeared in few television advertisements and in several music videos of her label mates, including Jun. K's "No Love", Got7's "Girls Girls Girls" and miss A's "Only You." She also made a cameo appearance in the second episode of KBS2's 2012 Korean drama Dream High 2. In 2017, she, along with Nichkhun, starred in the music video of Jun. K's "Your Wedding".
- Languages spoke: Korean, Japanese
- Training period: 2010 - 2015
- Star sign: Virgo
- Schooling: KonKuk University (majoring in film)
- Nayeon's ideal type is someone who is buff.
- Nayeon once sang BTS' "Fire" while she was sleeping on a heating pad.
- Nayeon has the biggest hands in Twice.
- Nayeon smacks her lips, like she's eating something, while she sleeps.
- Nayeon is the best at acting cute, according to the members.
- Nayeon gets scared of fireworks.
- Nayeon joined JYP as a trainee on September 15, 2010.
- Nayeon always accidentally leaves her glasses in the freezer.
- Nayeon is close friends with Red Velvet's Yeri.