In Li Chang's heart, he actually had no idea about Lao Fan's specific identity because after all, he didn't even know Lao Fan's real name. He only knew of Lao Fan's exceptional medical skills and his vast connections in the Capital. As for Xia Zheng's identity, he knew even less, just that Lao Fan was very fond of him. For the sake of Lao Fan, if not the monk then the Buddha, Li Chang would accommodate Xia Zheng accordingly, which was why he initially heeded his words and had locked up Wang Tianba and the others.
However, when Xia Zheng touched his pride, Li Chang no longer cared who Lao Fan was. Moreover, capturing Xia Zheng might even make Lao Fan come to him with a brazen face to beg for his release, allowing Li Chang to sell a huge favor to Lao Fan. Then he would see if the old geezer dared not to come and treat him again!