Wu Chang is the only dentist in the city.
There used to be other dentists. However, Wu Chang gave everyone a different feeling than others: at least, his recliner was blue, and his huge instruments were not pale. It's as if being in the most unpleasant place makes people happy for no reason. Besides, it's not expensive and people like it.
Wu Chang is the only Begonia in the city.
Concept: Emotional interweaving