Confused

I don’t really think there is a storyline I think it’s just for cutest and laughs cause I’ve been reading since the first chapter

so far in the translated chapters there isn't that much revealed yet but basically there is a war going on between satan and cain and the humans are being used as "doors" for demons to travel between hell and the mortal world. kyungjoon is so far the only human door who hasn't gone insane like the others, which is what his police dept is investigating