Song Ji Eun (송지은) was born on May 5, 1990, in Seoul, South Korea and debuted in the entertainment industry as a member of the Korean girl group SECRET under TS Entertainment in 2009.

Aside from her group, Song released music as a soloist and also made appearances as an actress in various dramas and movies.

Song was active in the group SECRET until 2017, due to her contract not being valid as she did not follow the terms of her contract. As a result, she announced to her Instagram that she was leaving SECRET and TS Entertainment. After her departure from SECRET, Song would not make a comeback until three years later, with her third mini album entitled Dream, with the titular track “MIL (Make it Love)” in late July.