Reborn in 1996, the soft and adorable four-year-old Bei Yao knocks on the door across from hers—behind it lives a boy from twenty years in the future. That boy is Pei Chuan, five years old, withdrawn and self-doubting, with crippled legs. As they grow up, their lives intertwine. By the time they're seventeen, Bei Yao has become the most beautiful girl in school, while Pei Chuan, cold and guarded, grips the armrests of his wheelchair and warns her, “Don’t say you like me again, or else…” But she just wraps her arms around his neck, smiling sweetly. His defenses crumble as he pulls her close. She’s been the love of his life across two lifetimes, and now she just wants to know—what does the devil’s body temperature feel like? A tender story of mutual healing between a sensitive, self-conscious boy and the angel who lights up his world.