Stephan Mueller walks in a park in Lanzhou, capital of northwest China's Gansu Province, Oct. 23, 2018. Stephan, 48, came to China to work as an expatriate from Germany in 2006, and 4 years later he had his own home in China after he married a Chinese wife. In the following years, he travelled extensively in China with his wife, made more friends and learned more about Chinese society. (Xinhua/Chen Bin)