The end of the world arrives, zombies besiege the city, and sixty-year-old peasant woman Li Sufang leaps off the city wall so as not to be a burden to her son, but unexpectedly travels through time to the demon realm. Endowed with the bloodline of Shennong, she uses a hoe to cultivate dead spiritual plants back to life, wins the trust of the demon race, and even uses the power of the sacred tree to shuttle between the two realms, bringing back food and spiritual medicine for the doomsday. However, behind the sacred tree entangles a century-old grievance among the cultivation realm, the demon realm, and the human realm; a black-robed evil cultivator secretly manipulates the zombie tide, and the Xuantian Sect presses forward step by step. When the source of the zombie virus floats to the surface, Li Sufang takes on the karma of the three realms with a mortal body, farming, saving people, breaking the deadlock—at the end of the doomsday, it turns out to be a tree blooming with golden flowers.