Speculated Nanyue ruins are discovered on a certain island. According to legend, they may be the treasure trove of Nanyue’s Prime Minister Lyu Jia. As a typhoon approaches, Wu Hen, a wilderness survival expert with extraordinary hearing, is invited by Nanyue historian Gu Lin to help the archaeological team salvage cultural relics. However, they unexpectedly discover a cave that is far from Lyu Jia's era, and thus embark on an adventure, revealing a thousand-year-old historical secret.