The Home of WuXing

There are powerful spirits exist in our world called "WuXing". They are mainly everywhere, and they live wildly. They originally came from the far east, they came to west in these recent years. There are five types of them: wood, fire, earth, gold, and water. Only the people who was chosen by them can see them when the person turned 16. Iris is a girl who was chosen by WuXing. But chosen by them not always, or never, is a easy and "lucky" thing. But why WuXing exists? What will happen to Iris if being chosen by WuXing is an "Unlucky thing?"