The comet virus ravages the earth, and most of the world's humans are infected and become zombies. The remaining humans live in an underground city called the Shire. Xiao Yan, a rookie researcher, longs for a stable and lazy life. During a mission, he is saved by Hai Yin, a famous figure in the special mission force. Xiao Yan is deeply attracted to Hai Yin, and Hai Yin also begins to think about how to ensnare the rookie researcher...