Sweet Serial Killer {bts, exo , got7 , straykids FF}

Luna is always the bully victim in school...well most of the time..
Luna has gone through a lot that no one can imagine.....
.............
But no one knows that Luna has a secret that she aint telling anyone
she's a whole different person sometimes....
no one knows the other her....
and if anybody knows the secret and tells someone else....
.............
"guys she's after us..."
"run, run, run"
too late Luna is already infront of them
facing bambam with the most fakest sweet smile ever
she took out a knife
"well....sad you guys cant run for your lives...be ready to die...."
she pointed the knife at bambam
"you tell the police my secret say bye bye to everything you love....everyone you love...i'm giving you one...more...chance"
"I-I wo-wont t-t-tell..."
"good.."
Luna gave bambam a kiss on the cheek to tease him
"ta-ta, boys" she did the peace sign and ran before the police could catch her
.............
Luna wants to love someone....but she just cant fall inlove...cause she is a psychopath she cant feel all those stuff...
but this one guy....changes everything....
Luna goes obsessed over him....and does anything to save him
the 'sweet serial killer' style