Born: 2000-09-15
Place of Birth: South Korea
Known For: Acting
Also Known As:
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.