After becoming a Qi Practitioner, he had been traveling around on his own, even staying in the monsters' land for half a year without any formal instruction or training and armed with only his own wits and Xin Huo's guidance. This lack of formal education resulted in his complete ignorance of the ways of cultivating the soul.
Besides, Xin Huo was an extremely unreliable guy as well and had never taught Zhong Yue how to properly cultivate his soul. If 'Shui Qingyan' had never off-handedly mention that the moonlight could bring benefits to the soul, god knew how long it would have taken him to obtain a proper method of cultivating his soul.
Therefore, 'Shui Qingyan' could be considered as pointing out a way to Zhong Yue and providing him with a big help!
He then continued to cultivate day and night. However, as time passed, the moon spirit's cultivation began to stagnate, whereas the sun spirit's cultivation speed increased even more.
