Yi Hongyi's black physique and outstanding appearance made him discovered by a star-making company and planned to participate in another reality show. While he was undergoing repairs, he came to the filming location - Cangyuan, Yunnan - in advance. However, after ascending to the local sinkhole known as Shenkeng, he accidentally fell off a cliff. By chance, he met a mysterious girl who lived in the cave below. The underground cave was a world he had never seen before, with all kinds of magical plants and animals, like a lost civilization or a world that had never been discovered.