Mu Jinyu felt astonished.
The "True Dragon Art" he practiced was a secret technique taught to him by his master, Mu Shao'ai, from a young age. From the start, he was told it wasn't very useful, but if practiced for a long time, it might, like Xiang Mantang, awaken his bloodline power.
Therefore, Mu Jinyu often cultivated, but even by the time he was eighteen, he hadn't been able to display the potential of this secret technique. It was only when Xiang Mantang performed the "Blood Phoenix Slaughter Art" and activated his Blood Phoenix Bloodline, losing control in a state of killing intent, that Mu Jinyu was able to use this secret technique to calm him down.
This situation continued until Xiang Mantang was possessed by a ghost shadow, greatly activating his Blood Phoenix Bloodline. It was only during their interaction that Mu Jinyu tried once more to perform the "True Dragon Art" and successfully activated his Azure Dragon Bloodline...