
Brilliant physicist Erin is desperate: her father is seriously ill and needs a million dollars for surgery. Her boyfriend Julian cheats on her with her best friend Chloe, sells four years of her life’s work—controlled nuclear fusion research data—to an arms dealer, and has her thrown out of the research institute. On a rainy night, with nowhere left to turn, Erin is rescued by a black car. A mysterious man named Alexander offers her a deal: one year as his exclusive companion in exchange for the money. But Alexander is no ordinary sugar daddy. Fourteen years ago, a young Erin was a ray of light in his life. He chased off her bullies, but she was so frightened that she called the police and had him arrested, and the two were separated. In the fourteen years since, he has never forgotten her and has watched over her from the shadows. He rebuilds her research institute and recovers her data, but his identity and their past keep sparking misunderstandings. With a scientist’s reason and tenderness, Erin slowly melts the ice around his heart. Julian colludes with arms dealer Leon Black to get revenge, and a political marriage within the mafia tries to pull Alexander away from Erin. In the end, Alexander refuses the arranged marriage, goes to war for love, and confesses his true feelings to Erin. The two sign a new contract—“indefinite and unconditional”—and spend the rest of their lives together in the name of love.