The apocalypse came in 2045. Lin Fan, a poor boy, died tragically under the attack of floods and robbers, but was accidentally reborn thirty days before the apocalypse and was bound to the "apocalyptic sign-in system". With his prophetic knowledge and system supplies, he hoarded goods, renovated rental houses, and prepared frantically for war. On the day of the natural disaster, he rescued Zhang Ya, a wealthy woman who was trapped in an elevator and out of reach in her previous life. The two crossed the class gap and lived together in the ruins where water and electricity were cut off, and humanity was annihilated. From dealing with greedy neighbors to forming a team to resist the tide of mutant beasts, from heavy rains and floods to extreme snowstorms, Lin Fan counterattacked with wisdom and responsibility and became the king of survival, while Zhang Ya lost her squeamishness and grew up rapidly. The surprise of system sign-in, the laughter and cruelty in survival are intertwined. In the cruel background of desperate survival, a post-apocalyptic legend about adhering to kindness and protecting love is composed.
