A story where a madly in love couple stuck in a zombie apocalypse with their classmates . Kim ( Y/n ) and Lee Su-hyeok . The both of them grew up together with their best friend , Jung Do-hwan . ( Y/n ) who craved for parents love , join the military special unit when she's 14 years old so that she could be close with her parents not knowing that they have been very distance with her for her safety . Of course , her best friend and boyfriend didn't approve but she promised that if she ever almost lose her life , she'll quit . And she kept that promise . On her 57th mission when she's 17 years old , she almost died as her teammates died making her quit but luckily her best friends were there for her . Then one day on a normal day at Hyosan High School , a virus started to spread turning the others into a bloodthristy creature after getting bit . Will ( y/n ) and the others stay alive together or there is someone who need to stay ? Lee Su-hyeok X Fem!Reader Male!OC X Choi Nam-ra