Back From the Death's Door

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... (Source: Bilibili, translated)