Character Arc
O-gwi is the central antagonist of Twelve, a powerful spirit associated with the crow who reawakens after being sealed away by the zodiac guardians long ago. Played by Park Hyung-sik, O-gwi represents the demonic threat that the Twelve once defeated at great cost, and his return drives the main conflict of the series as the guardians scramble to confront an enemy they believed had been contained.
Where the guardians embody protection and order, O-gwi embodies vengeance and the unfinished business of the ancient sealing. His reawakening reopens old wounds for Tae-san and the other immortals, particularly the loss of the four guardians who died binding him. As his power grows, he forces the scattered Twelve to reunite and to reckon with the choices made generations earlier, making him both a physical threat and a living reminder of the cost of their past victory.
Within the show's heightened fantasy framing, O-gwi functions as the dark mirror to the guardians' heroism, raising the stakes of their mission to defend the human world. His menace is rendered through supernatural spectacle rather than graphic violence. As a recent release, details about O-gwi's origins and motivations should be verified against official sources.