This person was none other than Xu You, who later became Song Chongjin's mentor and was also a student of Grand Scholar Qi. He had received the Qi Family's kindness, but when disaster befell the Qi Family, he, with his limited capabilities, could do nothing.
Moreover, because of his involvement with the Qi Family, he was barred from holding an official post, and, given the relationship between Song Hong and the Qi Family, he simply sought refuge with Song Hong.
Upon hearing that this Song Chongjin was the child of Song Hong and Qi Huan, Xu You did not hesitate to take it upon himself to mentor Song Chongjin.
Driven by a mix of empathetic sentiment and the desire to repay a debt, Xu You held Song Chongjin in high regard and even bestowed upon him his years of accumulated expertise in intelligence gathering.