“Investigation no.3: Mr and Mrs Zhang” is the third investigation presented by ifa gallery in Art Paris. While, “investigation no.1” focused on consciousness; “investigation no.2: Facing Distance” focused on the medium of the artworks that require particular distance; “Investigation no.3: Mr and Mrs Zhang”, the final exhibition of the series, focuses on human relationships by showcasing Dai Guangyu, Christophe Demaitre, Fan Jiupeng, Gao Brothers, Li Rui and Zane Mellupe.