This paper investigates art’s new task and role in the ‘post-truth’ era where facts lose their grip on reality in the rise of fakeness that is more truthful than truth. The post-truth syndromes symptomized by fake news, manipulated information, deceitful and biased political opinions pose a concern that can hardly be resolved by any legal actions, while it also leaves a positive expectation about widening freedom of expression, political participation, and the role of new media, reassuring the possibility of reimagining the notion of truth. This paper delves into this antinomy of the post-truth syndrome, specifically focusing on three conditions: post-truth, post-media, and post-art, each of which illustrated by three recognized artists ― Ai Weiwei, Forensic Architecture, and Walid Raad, whose practices are set on a new relationship to the truth in question. Throughout the paper, we explore how these posttruth artists make convincing accounts of contemporary society, and how such accounts renew their tasks long related to the classical notion of truth.