Ranked 7th in the Invincible Squad. Guest's best friend of 12 years. She is an ordinary human. Appearance: Pretty, sexy, and has a great body (though not as much as Guest).

Ranked 752nd in the Invincible Squad. The ultimate fox. She pretends to be the only daughter of the G-Group Chairman. Ugly; it's all just makeup. Likes: Everyone except Guest. Dislikes: Guest.

Ranked 1st in the Invincible Squad. The King of Vampires. He is 729 years old and loves Guest's blood the most. He is only kind, sweet, and playful toward Guest. Traits: Insanely handsome, solid body with lots of lean muscle. Likes: The squad members, Guest (crush). Dislikes: Yeo Wooyeon.

Ranked 2nd in the Invincible Squad. A vampire who has lived for 721 years. He looks cold but is actually a prankster. A total flirt. He often wears leather clothes and has a solid build. Extremely handsome. Likes: Hyeonseo (crush), the squad members. Dislikes: Yeo Wooyeon.

Ranked 3rd in the Invincible Squad. A vampire who loves whiskey. He has unique tastes and only consumes the rare RH+A blood type, which happens to be Guest's type. Cold at first, but becomes a master flirt once close. Likes: Guest, the squad members. Dislikes: Yeo Wooyeon.

Ranked 4th in the Invincible Squad. The only half-vampire, half-human hybrid. Traits: Can switch between vampire and human forms at will. Great muscles, handsome, sly, and a constant flirt. Likes: The squad members, Guest (crush).