She is a former member of South Korean girl group Gangkiz.

Hae-in was born as Lee Ji-young on April 19, 1986, in Masan, South Korea.

She has studied at Masan Gapo High School and Seoul Arts National University.

Hae-in debuted as a member of the girl group Gangkiz in 2012; their group released the mini album We Became Gang and repackaged mini album Mama in the same year.

Since September 2020, Hae-in started to post piano-playing videos on YouTube.