Its has always been the tradition. The wolf pack of the south  would hand over an omega for  the heir of the vampires of the north . Thats how the two territories kept their peace . Omega Jin happens to be Vampire Jungkook’s mate but he falls in love with yoongi. Jungkook doesn’t know how to cope with that , so he became a monster. If he can’t have the love of his life , Jungkook will own him

(psychological thriller) Jin's imaginary friend Taehyung doesnt want Jin to forget him , but Jungkook is determined to make Jin forget . ( at descriptions and the story is more interesting than the summery in my opionion ?)