Wu Yan was accidentally involved in a secret exploration related to the ancient "Youmen" civilization because of the mysterious items left behind by his family. This civilization that once mastered twisted growth technology caused disaster at a huge cost. Its ruins and the mystery of the "source of immortality" are buried deep in sinister ancient tombs in China and even abroad.
On the way, Wu Yan met the money-hungry but reliable Fatty Wang, and Zhang Hai, a taciturn man with amazing fighting power and a mysterious life experience, gradually took shape of the "Iron Triangle". They followed the clues, from the mysterious ancient village shrouded in mist to the ghost ship coffin deep in the river, to the extremely cold snow-capped mountain ruins in the west, and the hot and humid Earthworm Valley in the south... Every ruin hid supernatural dangers - zombies, strange creatures, Qimen Dunjia came in turn, and multinational "companies" pursuing immortality were pressing closer, and mysterious families were both enemies and friends.
The "keys" scattered all over the place are the key to unlocking the ultimate secret of the Youmen civilization, and every acquisition is accompanied by a life-and-death contest. As the adventure deepens, Zhang Hai's scattered memories, the crazy immortality experiments of the Yumeng civilization, and the truth about the decline of civilization gradually emerge. They grow up in a desperate situation, stick to their friendship amidst suspicion, move towards the final "Gate to the Ruins", face the truth and price of immortality, and also fight against the dark conspiracy that can subvert everything.
