A brief introduction to the story of the dragon;
Ricardo M. Lu is just an ordinary and ignorant high school student, and a letter from Castle College changed his ordinary life. Under the call of blood and mystery, under the choice of love and dreams, he resolutely chose the unknown. A black helicopter flew across the sky, and the door of a strange country slowly opened to him, and ordinary children in China embarked on an extraordinary road of killing dragons.
However, the distant Castle College is full of mysterious courses, funny seniors, crazy teachers and proud classmates. When Ricardo Milu first entered school, countless strange things happened. However, the next challenges have also begun, such as grade examination, voice test and map search. The dragon's world finally unveiled its mystery underwater.