Minho is an average 21-year-old guy who lives in Busan. He loves cats, he has three cats Soongie, Doongie and Dorie. He has six best friends, Felix, I.N, Hyunjin, Changbin, Seungmin and Bangchan. He is usually always with them. Minho is very rude, cold-hearted to everyone, even his friends, but they like him that way. He doesn't really believe in anything good.

In a world where time isn't linear, seven vampires share a bloodline while each being different. They're not simple predators — they're guardians. "Orange blood" is a rare phenomenon: a blood that can break a vampire's immortality or turn them human again. It appears in only one person per generation. It's appeared again: you. The seven vampires: Jungwon — the leader and guardian of Balance, with altered time perception who sees fragments of past and future. Calm, but menacing. Heeseung — the oldest in the group, able to read memories; melancholic and mysterious. Jay — the warrior and strategic protector; intense and unpredictable, with anger that sometimes clouds his judgment. Jake — the mediator between humans and vampires; warm, reassuring, and still very human. Sunghoon, "The Cold Blade" — a hunter with near-invisible movement; aloof, elegant, and emotionally restrained. Sunoo, "The Seductress" — a manipulator who controls others' emotions; outwardly kind and takes pleasure in playing the part. Ni-Ki — the youngest and most dangerous: a wild predator.

Lee Know: He's an elite killer, cold, liar, one of the best fighters, confident, aggressive, don't love nobody, cruel, but he's really sexy... Han Jisung/you: He's an assassin, his life was really tragic and he decided he'll live liket this... killing people, but he loves it and he's really good at it, cold, but deep inside he needs love and attention, cute sometimes, from outside he's cute and innocent but inside he's the evil itself. Story: Han has got a mission from someone. The mission is simple... kill Lee Know. This isn't hard. Like his other missions, but then something happened what he didn't expect... he don't know why, but he can't kill Lee Know... and this is a big mistake, because If he won't kill Lee Know... he'll kill Han.