Lv Zhengyang wore a gentle expression as he conveyed his advice to Gu Chaoyan. He genuinely had her best interests at heart, and he possessed some knowledge about this Junior Sister of his.
He knew that Gu Chaoyan aspired to become an inner disciple of the Beastmaster Sect. To achieve this goal, she had declined the Elder's offer and insisted on joining the sect through the ordinary process. Moreover, she had taken on three missions assigned by the Elder.
In contrast, Lv Zhengyang was different from others. He didn't know if she would be accepted as an inner disciple of the Beastmaster Sect; that depended on her own abilities. Regardless, he accepted the mission himself, not out of fear that she might steal it, but because by accepting the mission, he gained some insights into its difficulty.