World Of Ten Billion summary:

Haven, endowed with innate talent, beauty, and special abilities, was the pride of the Siren royal family, garnering great expectations.One day, due to a sudden turn of events, Haven had to endure a significant event involving the destruction of her family and race at the hands of a fairy. Avoiding the fairies who might still be searching for her, Haven disguises herself by cross-dressing, concealing her identity as an ordinary human herbalist. While everyone dreams of the resurrection and revenge of the royal family, Haven’s thoughts seem to diverge a bit.