• Alias: The Devil Character Profile & Traits • Overwhelming Strength and Ferocity A high schooler feared by surrounding delinquents as "The Devil." He is merciless, possessing a cruel streak that leads him to crush opponents for whimsical or irrational reasons. • Lethal Footwork (Taekwondo) The son of a Taekwondo dojo master, he boasts overwhelming kicking techniques drilled into him since childhood. He toys with opponents using blindingly fast consecutive kicks, heavy roundhouse kicks that knock targets unconscious in one blow, and unique footwork. • Rivalry with Hobin Yu He stands as the "first major wall" of overwhelming strength in the path of Hobin Yu, who rises through NewTube. As a powerful enemy who highlights the climax of the first season, he tests how far the teachings of Hobin's master, Samdak, can truly go.

Physical Data • Height/Weight: Official figures not disclosed. • Estimation: Set as a look-alike to the protagonist Hobin Yu (who is in the low 170cm range), but since Mangi is more muscular, he is estimated to have a toned build of just over 170cm and around 68-70kg. Personality • Cold and Cunning: A despicable opportunist who tries to take over the channel by impersonating Hobin. • Arrogant yet Pragmatic: While he tends to look down on those he deems inferior and gets careless, he also shows a shrewd side, reluctantly cooperating with Hobin's group after being abandoned by his secret boss. Style • Authentic Kickboxing: Fights using strikes and sharp kicking techniques on par with professionals, trained within a yakuza organization.