Charles worked for Holland-China Trading Company (HCHC) in Shanghai.
The photo shows one of its first directors, Willem Kien, with a group of friends in the Hong Kong countryside.
Willem Kien is listed as William Kien on several juror's lists on gwulo.com. E.g. the 1906 list, where he is shown as manager of Holland China Handels Co., situated in Alexandra Buildings. In 1915, also his house address is displayed in the list: 7 Stewart Terrace, The Peak.
Courtesy Kien family archives