Her brother, who had been dead for a long time, was suddenly told that he was still alive, but living in another time and space. The maid who had been serving her turned out to be the youngest princess in the current Holy Emperor. Her family turned out to be one of the four major families that guarded the stability of this space. All of this changed her eighteen years of life. She must shoulder her own mission. , Went to a space that she had never understood to find her brother, and the eldest prince who is now the Holy Emperor. However, the enemies who had always wanted to destroy the stability of the space for the purpose of domination also caught up with her. She met the destined person in a time and space that she should not have come to, and faced many missions. At a young age, can she survive the various setbacks and tribulations in her life with strength? How to make a choice in the face of undying love?