When they'd pledged Feng Tianlan to the Third Prince, the Fengs had handed over their family treasure as a token of the engagement. Feng Xiang didn't know what the secret treasure was, but it was definitely impressive enough to astound a country. To get his hands on it, he must either get it back after the wedding or annul the engagement, in which case the Emperor would simply return it. These were the only ways he could possibly obtain the token. Anyway, since Feng Tianlan was useless and dumb, it would be easy to swindle her.
However...
Although the Wargod had helped Feng Tianlan today, his stance on the matter remained to be seen. If he chose to intervene, it would be impossible for them to lay a finger on Feng Tianlan. Therefore, they must not let the Wargod think favorably about Feng Tianlan. They should make him hate her.
...