Once I saw a prompt to make a fic about woman!Bang and zelo on tumblr (I usually open banglo tag kkkkk), then I got an inspiration to make this (I really want to draw Zelo with long hair):

Z is a ordinary rebellious teenager and B is famous hitwoman who currently is doing an undercover mission as a librarian. They lived on the same apartment and one day, Z caught B on action accidentally and since that day, Z is forced to follow all B's order (or she'll kills him). Daehyun is B's enemy (I'm joking, I haven't thought that far kkkkk)

I guess I read manga too much!