At the beginning of the episode, Ouken's past is explored, and the origin of his transformation into a villain is revealed. His father, Satun, a king obsessed with dubious research, is the catalyst for Ouken diving deep into his pursuit of power and control. This initial focus lays the groundwork for the ensuing events and the inner struggle Ouken faces.


As the episode progresses, a notable moment occurs when Ouken, frustrated by his lack of superpowers, undergoes grueling training with his older brother. These scenes of arduous effort highlight Ouken's determination to grow stronger and underscore the familial tensions between the brothers.


The narrative then shifts gears, depicting Ouken's transformation after his successful experiment with immortality. However, his newfound powers come at a cost, causing him to gradually lose sight of his true self. These scenes effectively portray the duality of power—its potential to grant strength and its ability to corrupt.


In a poignant turn of events, Ouken becomes a war hero, repelling enemies and displaying extraordinary courage. The people hail him as the Sword King of the Underworld, solidifying his status and expanding his influence. His newly discovered superpower of rapid healing further contributes to his growing reputation.


Yet, Ouken's journey takes a dark turn as he becomes ruthlessly violent in battle. The prince's struggle with his changing self intensifies as his newfound immortality leads to an escalating bloodlust. This transformation marks a crucial narrative twist, adding depth to his character while injecting a sense of horror into the story.


Meanwhile, a letter to Despa, Ouken's older brother, unveils the secret behind Ouken's transformation, confirming that he has indeed become immortal. This revelation triggers a desperate search for a demon—the only means to lift the curse—highlighting the severity and complexity of Ouken's situation.


Toward the end of the episode, a sequence of events shows Ouken gradually succumbing to his bloodlust, becoming a feared monster in the eyes of the people. Despite the horrific circumstances, Ouken finds solace in the fact that he can still save lives, proving that he remains human despite his monstrous transformation.


The episode concludes with Despa acknowledging his responsibility as the King of the Underworld and resolving to intervene and stop Ouken.