Kim Da-hyun known mononymously as Dahyun, is a South Korean singer and rapper. She is a member of the South Korean girl group Twice formed by JYP Entertainment. Dahyun was born in Seongnam, Gyeonggi, on May 28, 1998. She grew up with her parents and she has an older brother. At a young age, she started singing with her Christian church choir. Dahyun first attracted attention as a sixth-grader in elementary school with a dance at church named the "eagle dance" which was posted on YouTube. Dahyun was recruited to become a trainee for JYP Entertainment after a talent scout saw her performance at a dance festival, and she subsequently trained with them for over three years.
In 2015, Dahyun competed in Sixteen, a reality television show created to select the members of JYP Entertainment’s new girl group. Dahyun was subsequently selected to join Twice, as one of the nine successful participants in the competition. In October 2015, Twice officially debuted with the release of their first mini-album, The Story Begins and the lead track "Like Ooh-Ahh". In addition to regular singing, Dahyun serves as one of Twice’s rappers, along with fellow group member Chaeyoung.
In Gallup Korea’s annual music poll for 2017, Dahyun was voted as the seventeenth most popular idol in South Korea.
Dahyun graduated from Hanlim Multi Art School in 2017.
In November 2018, Dahyun was criticized by right-wing Japanese lawmaker Masaru Onodera for wearing a T-shirt made by Marymond, an organization that raises funds for helping comfort women, victims of sexual slavery by the Imperial Japanese Army during World War II. In the aftermath, The Korea Times criticized J. Y. Park, the founder of JYP Entertainment, for failing to speak up in her defense.