Hello, according to the plot information you provided, I recommend the novel "Rebirth: The Lost Road of a Military Marriage" to you.😋The male protagonist had traveled from ancient times to the modern world and used to be a military agent. The female lead was an ordinary girl in the modern world. After meeting the male lead, they wandered together. The love between them was also a brother-sister relationship. I hope you like this fairy's recommendation. Muah ~😗