QUIET and observant, Luke Yiu does not give the impression of a typical 13-year-old. Perhaps it has something to do with his upbringing. His mother teaches English literature, his father is a professor of linguistics and he has loved books since he learned to read. And while most of his peers spent their time on ICQ and computer games, he wrote a book. The Form One student at St Paul's Co-Educational College may be a teenager of few spoken words but they certainly flow in his 20,000-word work of English fiction titled Galaxy Defenders. 'I enjoy writing far more than speaking,' he said. 'I can erase what I have written, but once something is said, there is no way to take it back.' Galaxy Defenders is an adventure story about six soldiers who set off to protect the Earth from space pirates but become lost in the universe. In each chapter, the soldiers - a hedgehog, a dog, a hare, a kangaroo, a mouse and a panda - battle monsters or struggle to keep their spacecraft flying. 'I am still too young to write something complicated,' Yiu said with a shy smile. The book has been a long project for Yiu. The story outline came to him four years ago after he read a series of books in which all the characters were animals. Yiu scribbled away whenever an idea came to him. With only the summer holidays and weekends to write, he could not afford to let the ideas slip away. Surprisingly, Yiu has little desire to become a professional writer. 'It isn't always the best thing to turn your interest into a profession,' he said. 'It would be tough if I couldn't think of an idea and was under pressure to produce something.' Yiu admitted that he does not always enjoy writing. His 'weak spots' are book reports and emotional pieces. 'Very often those who set the subject of a piece expect something specific. I sometimes don't know what they want,' he said. 'It is more difficult with book reports. People have different feelings about the same book. It can be difficult for them to understand what others feel.' Yiu has started his second writing project which is more about people. Studying psychology would help him capture them better on paper, he said. The subject this time is school life. So, if Yiu locks his thoughtful gaze on you, you could be on your way to being in his second book.