After accidentally falling into the haunted realm, Shen Yan activates the Myriad Worlds Supermarket System and struggles to survive in a perilous otherworld alongside his young daughter. Not adept at direct combat, he relies on the system's merchandise and contracts to establish rules, running a midnight supermarket where he trades and negotiates with all kinds of supernatural beings. Along the way, Shen Yan meets Ye Qinglan, a powerful businesswoman, and gradually gathers trustworthy companions. As the spatial barrier between reality and the haunted realm nears collapse and a catastrophe approaches, he unites forces from all sides to avert disaster. While protecting his daughter as she grows up safely, he also opens a trade route between the two worlds, building a business against all odds and forming sincere emotional bonds.