Mia, the eldest daughter of the Alfred family—lost for over twenty years and known in the equestrian world by the alias "Legendary Rider Epona"—was raised by the equestrian master Lier. She returns to the wealthy clan incognito, determined to uncover the truth behind her mother's fatal fall from a cliff years ago. At the family's grand equestrian gala, Mia dominates the competition, defeating the second daughter, Vina, to claim the championship; she is subsequently recognized as a true family member thanks to a distinctive pentagram birthmark on her arm. Fearing Mia threatens her status, Vina’s biological mother, Martha, hires thugs to ambush her and steal her horse, but Mia’s exceptional skills allow her to overpower and subdue them. Martha then conspires with the villainous Morsos to coerce the thugs into framing Mia, but Mia’s hacker friend, Ryan, uncovers evidence that turns the tables, leading to the confinement of Martha and Vina. The butler secretly releases the pair. Martha recruits a rider to impersonate Epona in an open tournament, but Mia stages a spectacular comeback in the finals to win the title and expose the fraud on the spot. Enraged, Morsos holds Vina hostage, forcing Martha to steal the family's secret breeding techniques, while simultaneously attempting—and failing—to recruit Mia with a massive bribe. As Mia investigates her mother's death, the butler breaks down and confesses: Martha was the mastermind, and he was the one who personally pushed Mia's mother off the cliff. Mia pursues Martha; during a high-speed highway chase, Martha’s car overturns and explodes, killing her. Mia then infiltrates the family estate; desperate to save herself, Vina falsely claims to know Epona's whereabouts, prompting Mia to reveal her true identity publicly, with her mentor Lier arriving by helicopter to corroborate her story. In a fit of madness, Vina attempts to stab Mia but is killed by the very blade she wields. With her enemies vanquished and her past laid to rest, Mia leaves with her mentor.
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