Luo Qingqiu, as the last hidden guardian in the world, lives in seclusion in the city as a mortal. As the ancient seal loosens, evil things from outside the world are ready to move, and the world order is facing collapse. A college student with special physique or potential accidentally breaks into her world and breaks her peace. Luo Qingqiu secretly observes, guides, and tests the protagonist, and gradually trains him to become a new guardian to jointly fight against the coming catastrophe. During this process, Luo Qingqiu's closed heart was gradually melted by the protagonist, and the ancient secrets she carried gradually surfaced.
