 In July, the group released their fifth EP, "Everyday 4", with the lead single "Darling",which ranked 27th on Melon's digital annual chart.On October 15, the group released the EP and ballad single "I Miss You" ("보고싶어").In May 2015, Girl's Day released the single "Hello Bubble" in an endorsement with haircare brand Mise-en-scène.