 Cheng, together with Sylvia Chang and Mike He, was appointed as an ambassador for World Vision in December 2009.2009 was a quiet year for the television star, who spent the year busy with his theatre debut, Design for Living, starring opposite stage veterans Sylvia Chang and David Wang, under the directorship of Hong Kong stage director Edward Lam.The troupe made several sell-out shows in Hong Kong, China, Taiwan and Singapore.