The fact that the Yellow Springs was young was a good thing for Chu Mu. 

Once a soul pet matured, it was very difficult to tame. Even if there was a soul pact, there would often be a conflict in views. 

For example the soul pact with Yu Suo. If it wasn’t because she was afraid of Chu Mu locking her up, Yu Suo wouldn’t listen to a word of Chu Mu’s, let alone his fighting commands; she may even command Chu Mu’s fights. 

This was because soul pets were mature before signing a soul pact and had complete ideologies they believed in. They would therefore have no tacit understanding in their cooperation with a soul pet trainer. 

From the tone the mermaid princess used, the Yellow Springs was probably a very famous young evil tyrant of the Ocean Species that everyone feared. They wanted him to guide it upon a proper path. While Chu Mu himself had done numerous evil things, the task of reform and guidance would be best handed over to Ning Maner. 

No matter the case, since there was a Yellow Springs here, Chu Mu had to have a look and try. If he could sign a soul pact, that would be the best. 

The mermaid princess personally...