Kaz's best friend, Zephyr, suddenly disappeared only to reappear injured beyond saving! When Zephyr died, it was only then Kaz knew why he went missing. He realized it was his fault what happened to Zephyr. It could've been anyone Kaz knew, Zephyr was just unlucky. Kaz lived five years after the incident before dying from a car accident. Thinking it was the end, he woke up in his sixteen year old self. Two years before Zephyr went missing.