Yoo Jeong-yeon, known mononymously as Jeongyeon (Korean: 정연), is a South Korean singer. She is a member of Twice, a South Korean girl group formed by JYP Entertainment.

Sixteen is a 2015 reality girl group survival show created by JYP Entertainment and Mnet. The show pitted sixteen trainees against one another to secure a spot in the girl group Twice. Sixteen contestants were assessed not just by their singing and dancing abilities but also their charisma and personality. The show ran from May 5 to July 7 on Mnet for ten episodes.