What made Mo Kang take a second look was Yue Jinghua's Primordial Spirit, a Primordial Spirit as brilliant as the star Venus.
Even during the era a thousand years ago when Mo Kang lived, where Dark Practitioners did not yet underestimate spiritual cultivation and only focused on Dark Skill, very few people at Yue Jinghua's age could cultivate such a strong Second Primordial Spirit.
Part of the reason Mo Kang was able to cultivate his Primordial Spirit was that when he was young, he learned a Spiritual Power Technique, which although was superficial, it helped preserve the last vestige of his Primordial Spirit's power when his physical body was devoured by the Dragon Transformation Pond.
To hide from his enemies and conceal his movements, he sealed away the Sky Dragon Palace, but even so, the power of his Primordial Spirit continued to dwindle like a candle burning over a thousand years.