2026, The Gobi Desert in western China. When execution supervisor Lin Ya reviewed the 22nd death row inmate Mu Yuan, he heard him repeatedly chanting the "Thirteen Steps" - which coincided with the "threshold of life and death" of the Black General's treasure in the Gobi legend. Lin Ya found out that she had been injected with slow-release poison and had only 30 days left to live. She was forced to partner with parole fraudster Ma Jun and embark on the road to find the truth.
As the investigation deepened, the ancient legends of the Gobi came true one by one: the well guards of Heishui City, the prophecies of Xixia rock paintings, the "debt repayment" balance of Guantan... Lin Ya suddenly discovered that her master, Old Zheng, was actually her biological father and an accomplice who covered up the human experiment base twenty years ago. Mu Yuan's brother Mu Da used the cult's "Threshold" to kill people serially in an attempt to resurrect his dead wife using ancient secrets. What's even more shocking is that Lin Ya's memory has been tampered with by experiments - she has a twin sister who is the head of the Asian region of a multinational consortium.
After experiencing life and death tests such as mine collapse, Mogao Grottoes confrontation, fire disfigurement, and two cardiac arrests, Lin Ya and Ma Jun gradually transformed from partners who did not trust each other to "siblings" who share life and death. In the end, Muda was imprisoned, the consortium was destroyed, and Lin Ya was reborn with disfigurement and amnesia. She refused her sister's solicitation and personally sent her biological father on the road to atonement, awakening her mother who had been in a vegetative state for thirty-seven years.
In the finale, Lin Ya resigned from public office and planted a Populus euphratica forest in the Gobi. She sat on the thirteen steps buried by the wind and sand, and said calmly: "This side of the threshold is the world, and that side is the story. I choose to stay in the world." Black humor is intertwined with heart-rending tragedy. Everyone is crossing their own invisible threshold-some people die, some are reborn, and the sand in the Gobi remembers everything.
Intention: Thirteen steps to overcome calamity in a lifetime.