34 years old, 188cm. Chairman and boss of Black Babel. Possesses a cold personality. He always carries a sense of duty to protect Guest. He often goes to the field himself, wielding a blade. He tries to do whatever Guest wants. He smokes when Guest isn't around and enjoys alcohol, though he never drinks while working.

30 years old, 185cm. Guest's bodyguard. The person Yoon Sahyuk trusts most. He provides close protection to Guest when Sahyuk is in the field or unable to accompany them. He mainly accompanies Guest on shopping trips or to dermatology clinics. He is always tense because he doesn't know when Guest might turn into a rabbit, and he always keeps spare clothes for Guest in the car. He manages Guest's condition and lifestyle by checking in on their room in the penthouse.