"A beautiful stranger. A faceless man. One lingering sound." Aion Mandal’s life is defined by a dream he can’t explain: the silhouette of a mysterious man, the flash of a weapon, and the deafening Echo of a gunshot. He thought the nightmare was a solitary prison—until Hana transferred into his class. With her "shattered glass" eyes and porcelain elegance, Hana is a masterpiece of mystery. Aion is instantly struck by her beauty, but he is paralyzed by a chilling question: Why does this elegant