C400 Look at It with Your Butt
Belham wasn't very curious, but Wenyu wanted to stop him from killing the dragon. Then he said he wanted to make a deal with him, which made him think that Wenyu wanted to make a deal with him with the giant dragon. That was why he asked about the deal. The giant dragon was the prey he dreamt of. As long as he could refine a dark dragon, he can easily kill other dragons