C643 The Blind Spot

"Is the Hidden Dragon Clan still here?"

Yang Xuan suddenly raised his head and asked. He had a feeling that if he could find the Hidden Dragon Clan, he might be able to solve all the mysteries.

Professor Gu sighed. "According to an ancient book, 400 years ago, the Hidden Dragon Clan mysteriously disappeared. From then on, there were no records of the Hidden Dragon Clan in the history books