The film centers on South, a young man plagued by a lifelong illness that has made him physically frail and the target of childhood bullying. He carries a constant sense of inadequacy, wishing for a cure. While exploring a riverbank, South discovers strange glowing objects. Drawn to them, he enters the water and is enveloped in a blinding light. He awakens the next morning with a strong, new physique and an extraordinary energy. Determined to use his newfound abilities for good, South secretly creates a superhero costume and begins working as a vigilante at night.