At first, Hyesung seemed like an ordinary school boy. But what if, one day, his life turns upside-down for the better or worse? Magicians, magical creatures, and magic schools. What will be in store?

17 years ago, a spirit came down to Earth and wreaked havoc across the world. Since the spirit's defeat, the world has been in peace. That is, until it came back and starts creating more spirits. Will the Lost Child members be able to stop them?