[3] In addition to her output as a solo artist, Juniel has released music as a member of the duos Romantic J (with Lee Jong-hyun),[4] and Poetic Narrator (with Doko).

[2][6] She started playing the guitar as a child,[7] and, at the age of 16, she wrote her first song, "Boy", which was later included on her first Japanese EP.

[15] On 22 May, Juniel released her first Korean song, a duet with Jung Yong-hwa, titled "Fool" (바보).

The music video for its lead single, "Bad Man", was released on the same day,[22] peaking at number four on both the Gaon and Billboard Korea K-Pop Hot 100 charts.

[21] Juniel received the Rookie Award at the 27th Golden Disk Awards on 15 January 2013, in Kuala Lumpur, Malaysia,[23] and was invited to perform at MIDEM festival's Happy Hour Business Party in Cannes, France, on 27 January 2013.

[26] The EP is composed of four songs: the lead track "Gwiyeoun Namja" (귀여운 남자; "Pretty Boy"), "Date" (데이트), "Jamkkodae" (잠꼬대; "Sleep Talking") and "My Lips".

[29] On 18 July, Juniel released a digital single titled "Love You More Than Ever" featuring Hanhae from PHANTOM as a part of producer Kim Do Hoon's 'DOKKUN PROJECT'.

[31] On 9 December, Juniel and CNBLUE's Lee Jonghyun formed a duet and released a winter special digital album called 'Romantic J' with the song titled "Love Falls".

[33] In April 2015, Juniel collaborated with Teen Top's Niel for release a duet called "Spring Love".