After the world war in the future, civilization has collapsed and the earth's surface has become a radioactive wasteland. Su Jing'an, a former undertaker and single mother, and her young son struggled to gain entry into the last batch of large-scale underground fortresses, "Ark No. 3." Inside the fortress, resources are extremely scarce, classes are strict, and human nature is dark. It is like a doomsday version of the "Grand View Garden". There are no zombies here, but there are human hearts that are scarier than zombies.
