Reborn in 1996, four-year-old Baozi Bun Bei Yao knocked on the door across the hall. Behind that door lived a boy who would become the world’s catastrophic devil twenty years later. The devil, Pei Chuan, was now five years old—a boy with broken legs, introverted and filled with self-hatred. Years later, they turned seventeen. Bei Yao became the most beautiful girl in their high school. Pei Chuan, cold-faced, gripped his wheelchair tightly and warned her: "If you say you like me again, I’ll…" But Bei Yao wrapped her arms around his neck and smiled sweetly. Pei Chuan couldn’t help but clasp her waist, his suppressed emotions crumbling beyond control. Having been his darling for two lifetimes, Bei Yao wondered—what was the devil’s temperature like?