The End of the World Is Coming, My Protagonist Brother

My best friend for many years actually told me that a large-scale zombie wave would begin in three days. He came back from the apocalypse with the system to make up for his previous regrets. At first I thought it was just an April Fool's Day joke, but I didn't expect that a large-scale infection actually occurred. As an abandoned house, what should I do? Don't be afraid, I have my protagonist brother! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.