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

Stage Name: I (아이)
Real Name: Cha Yunji (차윤지)
Birthday: December 2, 1996
Zodiac Sign: Sagittarius
Height: 157cm
Weight: 40kg
Blood Type: O
Fancafe: I
Profile: WM Profile
Twitter: I_WMOFFICIAL
Instagram: @yoooon_g_
Facebook: wmofficial.i
YouTube: I

I Facts:

-She is known as the younger sister of B1A4‘s Baro.
-She was born in Gwangju, South Korea.
-Her hobbies are nail art, painting, and playing the guitar.
-She was a contestant on The Uni+, but left due to health issues.
-Her specialty is choreography, fast memorization, and Japanese.
-Her charm point is her long eyelashes.
-She left WM Entertainment on October 5, 2018.