[1] Sunny Hill debuted in September 2007 as a co-ed group consisting of members Janghyun, Jubi, and Seung Ah.

Sunny Hill was quickly thrown into their first project under Nega Network by featuring on Narsha's digital single "Mamma Mia".

[3] On April 14, it was announced that Sunny Hill would be making comeback as four-member girl group with digital single, "Is the White Horse Coming?".

[5][unreliable source] The next day, it was reported that the song had topped in the several music site such as Soribada, Melon, Mnet, and Bugs.

[citation needed] On April 5, Sunny Hill released collaboration single Love Actually with South Korean modern rock group called Daybreak, as a part of project album Re:code - Episode III.

On April 6, the music video was released featured cameo appearances from comedian Kim Sungwon, Defconn, and ZE:A member Kwanghee.

[8] The song is an acoustic medium R&B produced by Kim Hyung Jun himself, while the music video has an innocent love story theme, filmed on Hanseo University's airfield.

The song is an upbeat mix of old pop and electronic that depicts the story about one's desires to return home, and get away from the tough side of reality.

[13] On August 18, 2017, LOEN Entertainment released a statement announcing that Sunny Hill had left the label and would continue as a group elsewhere.

[16] Kota auditioned to be part of the new project group WSG Wannabe and made it in, pausing her activities within Sunny Hill to participate.

[17] On September 16, 2023, Bitna, Eunju & Geonhee, began performing as a trio, and Kota confirmed via her Instagram that she had left the group, but supported them and wished them well in their future endeavours.