So that's why he had sent the person to her, why he had said those words about teaching her properly. But isn't this person a bit too ridiculous? She was so young, yet he still expected her to teach her, also claiming that he never engaged in futile efforts. Wasn't that just implying that she was a manipulative person?
Aside from not having the heart to deal harshly with Liu Cong to have him understand the cruelty of society, which was why he had sent him over, there might be another reason, probably the most important one, that made him willing to let Liu Cong out of his sight.
It was likely because he was afraid that, if he got too close to Liu Cong, he wouldn't be able to control the deeply hidden emotions that he had been suppressing with great difficulty. Such fervent emotions that had been repressed for so long, how could he possibly not reveal any clues if he were to spend his days with him?