To find her missing boyfriend Lin Yuanzhou, Shen Jiahe pretends to take her own life, only to accidentally fall into a strange secret realm and discover that her boyfriend is actually the dungeon boss. She clears one dungeon after another, resolving all kinds of dangers and schemes from other visitors while repeatedly reuniting with fragments of Lin Yuanzhou, who has lost parts of his memory. Through trials of life and death, the two move toward each other, and their bond grows ever deeper.