Bai Zhenkong was delighted because one, City Lord Fan had been receptive, and two, he accepted Bai Zhenkong's help. That was more than enough for him.
Despite his anxiousness, Zuo Wentang didn't show it on his face. Still, he told Bai Zhenkong about inviting Lin Jin to a drink as they were heading back.
He wouldn't be able to hide it anyway.
It was impossible to do so.
Bai Zhenkong wasn't an ignorant man. Although most tasks were handled by Zuo Wentang, Bai Zhenkong definitely had more than just one person working under him.
If news of him discreetly inviting Lin Jin out for drinks ever traveled to Bai Zhenkong's ears in the future, even if Zuo Wentang's intentions were wholly innocent, this city lord might still harbor suspicions.
Hence, it only made sense to be straightforward. It was imperative that he didn't display any signs of hidden intentions or self-interest.