Groups of friends sometimes grow apart, it's part of life. Some do because of big fights, people moving away or getting busy with their life. And sometimes the reason is unknown. Byulyi has learned to live with it and to enjoy that Hyejin and Wheein are still in her life, but Hyejin hasn't giving up on the hope of their group being reunited just yet. 

On Mamamoo's day off, Whee In finds herself rehearsing at RBW's studio. After being left alone, she makes an escape to the roof where memories of her and her best friend floods her mind.