Wang Xin, the owner of the tea stall in Wangyou Town, has practiced a pair of discerning eyes for medicine since childhood following her herb-farmer grandfather. One day, Senior Brother Zhou, an outer disciple of the Qingyun Sect, brought fake Qi-Gathering Pills to drink tea, and was exposed in public by Wang Xin, thereby offending Qian Tong, the shopkeeper of Huichuntang who sells fake pills. With the joint assistance of Ling Yunzhou, a sect deacon, Wang Xin disguised herself and sneaked into the back courtyard of Huichuntang, witnessing the fake pill workshop with her own eyes, and exposed the scam in public at the Fifteenth Grand Market, finally assisting the sect master's envoy to round up the counterfeiting gang that colluded with the sect elders. On the signboard of the tea stall, an extra line of 'Also Identifies Dan Pills' was added.