Lotte Department Store
On April 29, Brave Girls released a special version of "High Heels" in collaboration with shoe brand Elcanto. On May 5, they released a promotional single titled "Red Sun" as an advertisement for Lotte Department Store. On June 17, the group released their fifth mini album "Summer Queen" and its lead single "Chi Mat Ba Ram". The album peaked at number 3 on the Gaon Album Chart and the song peaked at the same position on the Gaon Digital Chart.