In the sun-soaked streets of Valencia, Diego-a brilliant but heartbroken physicist-wanders through life with a shattered soul after love betrays him at La Tomatina. Haunted by the ruins of trust, he searches not for romance, but for meaning, truth, and a love that feels as infinite as the universe he studies. Then he meets **Isabel Vega**. Elegant, disciplined, and deeply poetic, Isabel is the perfect equilibrium of science and soul. Where Diego is chaos, she is structure; where he sees equations, she sees poetry within them. Their meeting is not an accident-it feels like destiny written in the stars. From quiet university courtyards to the intimate glow of an apartment near Calle de la Paz, their love unfolds gently-built on shared coffee, physics debates, poetry scribbled on napkins, and an unspoken understanding that they are two minds seeking the same light. But when Isabel earns a life-changing research position at CERN in Switzerland, distance tests the constancy of their bond-their hearts entangled across countries, letters, starlight, and longing. Their love becomes something greater than passion-an **eternal equation**, defying space, time, and even mortality itself. ---