After surviving a deadly disaster, Hyeon Seonghwan finds himself transported to another world and unexpectedly becomes the owner of a maritime GN25 convenience store. To return home, he must achieve an impossible goal: accumulate ten billion won in sales. Armed with a mysterious sentient POS system that grants quests and rewards, Seonghwan navigates a world filled with monsters, magic, and eccentric customers. Alongside his beautiful but unpredictable werewolf employee, Ruen Heartsbite, he turns everyday convenience store operations into life-or-death adventures.