Orphaned Liam lost his parents during the apocalypse, yet he unexpectedly rebounded seven days before the disaster struck and awakened a mysterious storage space. He stood up to evil villains, stockpiled massive supplies in advance, built an impenetrable doomsday fortress, and protected his family. He also rescued virologist Cindy and young girl Lucy. In the end, they joined forces to develop an antidote serum, reversed the apocalyptic crisis, and established a safe Ark Base for survivors.