Are Han and Su the only ones?

No, Han and Su are not unique to Wuhan. Hanhesu originated from one of the traditional famous spots in Wuhan, Hubei Province, so it is very famous in Wuhan. However, nowadays, Han He has been bought off in many places. Because of its unique taste, Hanhe Crisp has become a popular pastry in China, which can be found in pastry shops or tourist attractions in many big cities. Therefore, if you are interested in Han and Su, you don't have to be confined to Wuhan, you can try somewhere else.