Park Ji Hyo (Hangul: 박지효) was born as Park Ji Soo (Hangul: 박지수) on February 1, 1997 in Guri, Gyeonggi-do, South Korea. She is the leader and main vocalist of the group.
When Ji Hyo was a third grader, she participated in a contest on Junior Naver for a child role. After she won second place, she was scouted by JYP Entertainment. She officially joined the company on July 15, 2005, and was a trainee for over 10 years. Ji Hyo was known mostly pre-debut as the face of Innisfree's teen line "TN" with boy band Boyfriend and later with future group mate Na Yeon. She was set to debut in the girl group 6mix along with future group mate Na Yeon, Jeong Yeon and Sana, prior to competing on Sixteen. She also appeared in the music video of miss A's "Only You". She legally changed her name from Ji Soo to Ji Hyo before Sixteen.
Ji Hyo collaborated with Apink's Jung Eun Ji and Ben for the first part of Inkigayo's special project called "Inkigayo Music Crush". Their ballad song titled "The Reason I Got Pretty" (내가 예뻐진 이유) was released on November 6, 2016 as a digital single.
