Fantasy Alternate Dimension

In this world, the earth is composed of two dimensions. 500,000 Years ago, the Dragon King Nidhogg was killed on the throne by humans. The World Tree separated one of the dimensions on the earth at the cost of his life, sealing the soul of the dragon blood hybrid human-dragon hybrid and the Dragon King. However, the seal will be broken one day. The World Tree split his soul in two and sent it to the earth. On the day of his 19th birthday, Blue City made a choice to go to the dimension to save the world. The characters and some of the story backgrounds in this novel are borrowed from Jiangnan Dada's work Dragon Clan. This book is very good, and part of my inspiration comes from it. I hope everyone can read this book. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.