The female protagonist was originally a human. She inherited something and awakened the dragon bloodline. She was a rare female dragon cub. She came to the galaxy from Earth and only became an adult at the age of 300.

This type of plot was very common. It usually involved a mysterious power or inheritance that gave the female protagonist a unique ability. The female protagonist might experience many adventures and challenges, grow and improve, and eventually become a powerful hero. In novels, the female protagonist's identity and background would often change and explore many things that might involve humans, dragons, other interstellar civilizations, and so on. In addition, the heroine's 300-year-old adulthood was also an interesting plot design that might involve her physical changes, life experiences, thinking process, and so on. This type of novel usually attracted the interest of many readers because they usually contained adventure, growth, love, power and other elements that could give readers a strong emotional resonance and reading experience.