Cha, Jin-u

Biografía

Beelzebub is a major character in the series, originally serving as a high-ranking entity from the mythical Abyssal Tower. Following Baphomet's mystical reincarnation into the human world, Beelzebub eventually manifests on Earth to track down his former master.

Human Identity

To operate undetected in human society, Beelzebub takes on a mortal human body and assumes the fake identity of Cha Jin-u. He establishes a cover story as the "younger brother" of Cha Min-woo (Baphomet's human body), moving into the same household to closely monitor him. Despite his fierce origin as a powerful demonic entity, his human facade forces him to masquerade as an ordinary, everyday student.

Personality & Earth Adaptation

While he initially arrives with a calculated, monitoring mindset regarding Baphomet, Jin-u accidentally develops a comical and deep attachment to human lifestyle comforts. He showcases a massive, recurring weakness for human food, regularly indulging in the home-cooked meals prepared by the neighborhood elders. He struggles to balance his prideful, demonic instincts with the mundane tasks of a human teenager, resulting in prominent comedic relief and slice-of-life interactions alongside the core narrative.

(Source: I Was the Final Boss Wiki)