Zhang Yi speculated.

Just like the previous Candling Dragon, who was Mu Chen.

In this life, Mu Chen was not a reborn like Zhang Yi, but he had insight into the future events of this life and knew he would die at Zhang Yi's hands. Thus, he sought revenge on Zhang Yi, attempting to eliminate him in advance and change the course of history.

The reason was that the Dark Dragon Emperor Iguno, who had traveled from the future of this life, gave Mu Chen the Heart of Memory, which contained Mu Chen's future memories, allowing him to access them.