Yun Xiang begins suspecting Ya Nan, who meets with her brother to discuss the next steps. He is vying for their mother’s position in the Lingyuan sect. Ya Nan realizes that Yun Xiang is becoming suspicious of her. Together, they trace back the missing tribute to mass purchases of charcoal to melt down the silver into smaller ingots. Detective Liu is on to them. (Source: frankly at MyDramaList)