In The Stand-In, Wallace plays two characters: Li Chongguang, the son of a rich businessman, and Deng Sidi, who is hired to be Chongguang’s stand-in after the latter is killed when acting as a decoy for Sun Yat-sen. Ah Si, as Sidi is known, thus finds himself caught in the middle of the strife between the revolutionaries and the Qing government.