This is a world that operates on the "Law of Cost." Follow your words? No, the "price" is what you say. Any extraordinary appeal or major lie must pay an equivalent price - perhaps memory, emotion, body, or even the fate of others. Gu Yan traveled here and faced death. However, he unexpectedly awakened the "tongue of truth" and was able to taste and eat lies, and even get a glimpse of the specific content of the "price". He became an anomaly who wandered on the edge of the rules. The Jingyan Division of the official family regards him as a sharp blade, the Price Villa who is eager to trade regards him as a rare commodity, and the Liar Sect who attempts to destroy the rules regards him as a mortal enemy. And he just wants to survive after paying the next price. Until he discovered that the collapse of this world had already begun with the first lie...