Abnormal Love

We are all beings such as vampires, fawns, ghosts, wolves etc. and we're all born with a necklace that has half of a unique shape, the other being who has the half of our unique necklace is our true love. Technically we have to search all of our lives to either find our other half or die alone by the time of human destruction. But what happens when a simple girl named "Sarah Angel" has a problem with her true love? In the mean while what happens with Harry Styles - vampire, Niall Horan - Angel, Liam Payne- ghost, Zayn Malik- werewolf & Louis Tomlinson-Immortal when they meet Sarah?