Sunny Hill (써니힐) is a four-member girl group under BOD Entertainment and MY Entertainment. They originally debuted as a co-ed group on September 20, 2007 with their first single "Love Letter". Janghyun left the group in January 2014 to pursue his career as a producer.
On August 18, 2017, LOEN announced the group had left the agency after their contracts expired on the 8th. On November 6, 2018, Jubi signed with Dmost Entertainment as an actress and subsequently left the group. On December 18, Misung left the group but would still contribute with the group as a lyricist, like former member Janghyun.
On April 5, 2019, it was announced that the group has signed with BOD Entertainment and would resume activities with two new members: Geonhee and Eunju.