In Trouble Already

No baby girl, you're staying with me tonight...

Just a friend, right? That's what they all say. Yeonjun's been Y/N's best friend for as long as she can remember. Every homework, every test, every breakup, every boyfriend. He's been by her side to support her along the way in every aspect of life. Now after fourteen years since they met, her best friend transforms in to her lover. Secrets to be told, blood to be spilled. After all, he had always seemed to good to be human. This isn't any usual love story. She doesn't fall for him, she falls with him in to a dark abyss they can't climb out of. Well that's what's meant to happen at least, but do they ever make it out and start again?