Dragons: Invisible Guardian

An admission notice from Kassel College broke the peaceful life of Gu Yuan and his sister. From then on, their lives changed from studying and making money to being dragon slayers walking in the dark. "Dragon King? That is beyond your ability to deal with, but there are still important tasks waiting for you to complete." Since the task of killing the Dragon King is not on me, then let me do what I can for this world. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.