So here comes the question. If you were Chen Yan's sister, what was your motive for telling him not to go out before going out? On the must-have skills for fighting zombies at home:
1. You need a zombie boyfriend
2. Same as above
3. Same as above
(Look at what I wrote)
Affectionate Zombie Attack × Tangled and Timid (?) Suffering
It's a short story, don't ask me why I can collapse a setting into such things.