What the heck happened? Kpop shocks and upsets in May. PT2: Gfriend

No matter if you’re a fan of the irresistible force of the Tsundere SinB or an admirer of the ditzy yet mysterious Eunha, the month of May had some really upsetting news in store for Gfriend fans. 
At the height of success having released the massively popular single Mago as the follow up to a string of successful releases and hits during the past years, the Kpop equivalent of Donna Tartts Secret History: Gfriend, abruptly announced that the 6 year old group had disbanded and left Source Music, the now subsidiary of Big Hit Entertainment of BTS fame. What the heck happened?