Também conhecido como: ICHILLIN' · Zhèng Zhìyūn · 鄭智赟 · 정지윤
Jiyoon (Korean: 정지윤; Chinese: 鄭智赟; Japanese: チョン・ジユン) is a South Korean singer under KM Entertainment. She is a member of the girl group ICHILLIN'. She is also a former trainee of Polaris Junior. She is best known for participating in Mnet's reality survival show Girls Planet 999.