Song Yu, having chosen to follow Wen Zhongyuan, naturally needed a reassurance pill, after all, he was staking his future. Since he had been cultivated by the Song family to engage in games at the Red Wall, it meant he wasn't devoid of brains. His current decision indicated that he was abandoning his former stance to become a strategist for Wen Zhongyuan, to put it bluntly, a subordinate.
In fact, such a move was a necessary evil. Although he was smart, he did not command the situation. The upper hand was with Wen Zhongyuan. His thought was that, if he couldn't be a lord, he should at least be a minister who could prop up a dragon, and in doing so, he could still have a splendid future. And the one he believed could make this happen was Wen Zhongyuan, never that rat poop Tang Ye!