Cosmic Prince, daughter of an engineer from Earth, galactic conspiracy and marriage mark. Who even thought that these elements could be related? But the prince turned out to be an intelligence agent and went on a dangerous mission, the daughter of an engineer from Earth did not suspect that the mission was her, the galactic conspiracy put their lives at risk, and the marriage mark tightly tied the bonds of blood. They are insanely different and hate each other, yet almost married. Alexander is a space prince. And Brilliana is not a simple hostage at all.