It's 2019 in Hong Kong and sixteen-year-old Phoenix fears the city she calls home could be lost forever. She defies her parents and joins a secret protest network. Meanwhile, seventeen-year-old Kai reluctantly joins the police academy to please his father. When Pheonix and Kai first meet, they accidentally swap phones. Kai realises he finally has a way to earn his father's approval: by going undercover and infiltrating the protest group. The clash of their opposing views ignites an undeniable spark. But when a relationship is built on deception, can they still love the person left behind when the lies fall away?