Cha Yoon-ji (; born December 2, 1996), better known by her stage name I (), is a South Korean singer and dancer formerly under WM Entertainment. She officially debuted on January 12, 2017 with her debut EP, I Dream. She joined ' in October 2017, but she left the show on November 24 due to health issues.
Cha was born in Gwangju and is the younger sister of Baro, a former member of B1A4.