In 2099, the doomsday game came without warning - zombies were rampant, order collapsed, and humans were thrown into a survival race. Ordinary college student Lin Xun accidentally awakened the "territory system" and learned that the only building that could withstand disasters, "Noah's Ark", needed to be occupied by circling. While others were still panicking and hoarding goods, he used the system rules to circle the building and unlocked benefits such as self-production of materials and beauty bonuses. This is not only a battle for survival, but also a game against doomsday with wisdom and courage - he wants to build the last shelter for mankind on the ruins of zombies and human hearts.