Four sisters trained to kill. Three strangers who taught them to feel. One oath that threatens to destroy them all. When the Queens of the Mafia fall for the witnesses they were supposed to silence, the real war begins not on the streets, but inside their own home.

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Ahyeon dulunya adalah gadis yang penuh cahaya, tertawa mudah, bermimpi tinggi, dan mencintai hidup sepenuhnya. Namun satu peristiwa menghancurkan segalanya, membuat jiwanya seolah mati bersama harapan yang ia kubur. Dan Dain, seorang psikiater yang membantu langit Ahyeon kembali biru.