The end has come, zombies are rampant, and the world has been reduced to ruins. Lin Yu, who was once an ordinary young man, unexpectedly obtained the heaven-defying sign-in system. On day one, sign in to get a well-equipped infantry squad! Looking at the resolute faces and listening to the neat and powerful "Orange!", Lin Yu clenched his fists. From then on, every day, he could sign in and get different surprises: advanced weapons, scarce supplies, super skills... In this desperate apocalypse, Lin Yu relied on the income from daily sign-ins to lead the infantry squad to overcome obstacles and build the last line of defense for human survival.
