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My Sister is the Grand Supreme Full Episode
001
A novice in ragged clothes tries to enter Flame Manor for the Fire House heir's engagement party but is stopped and insulted by a guard. Meanwhile, a powerful man returns from battle, his strength only partially restored since a seal broke, and decides not to draw attention by changing for the party, fearing his aura would attract Abyssal assassins and endanger his sister. The guard’s confrontation escalates until he realizes the poorly dressed woman is actually the bride’s sister.
002
A woman named Iris begs for forgiveness, having offended the powerful Earth Mage Lyra. Lyra's protective sibling orders guards to throw Iris out, but Iris pleads to stay, offering a gift. The scene shifts to a tender reunion between Lyra and her long-absent sister, who vows to repay her for years of sacrifice. The moment is shattered when a man named Dylan arrives and scornfully calls the sister a 'beggar mage.' Lyra fiercely corrects him, revealing the woman's true identity and sparking immediate tension.
003
A woman attends her sister Lyra's wedding, where she is confronted and insulted by the groom Dylan, who calls her 'trash from the slums' and demands she leave. When she refuses, stating she is Lyra's only family, Dylan orders men to take her to the backyard to 'teach her manners' of the magical world. Meanwhile, Dylan lies to Lyra about her sister's whereabouts, claiming she left for a bounty. In the backyard, the woman resolves to hide her true power to avoid exposure, as the men threaten her. She later returns, calmly stating she 'took care of something,' leaving the immediate confrontation unresolved.
004
At an engagement party hosted by the Firehouse, a man named Dylan prepares to introduce the powerful Lord Reynold, hoping to flaunt his connections. Observers remark on the family's future and mock the guards' recent defeat by a low-level mage, suggesting that raw power is meaningless in a world of status and politics. Meanwhile, the man's sister is told Lord Reynold is meditating and cannot be disturbed, undermining Dylan's attempt to prove his influence. The episode ends with Dylan publicly pushing for Lord Reynold's appearance, risking humiliation if the mage fails to show.
005
Iris is warned by her friend Lyra not to provoke the arrogant rich kid Dylan, fearing his retaliation. Defiantly, Iris vows to protect Lyra from Dylan's bullying and claims she can invite the powerful Reynold. Lyra scoffs that not even a House Head can summon Reynold, urging Iris to lay low at the party. Unbeknownst to them, Iris secretly possesses a powerful crystal core linked to a mysterious 'Supreme,' whose aura risks attracting dangerous 'Abyss' enemies. Despite the danger, Iris decides using the core is worth it to protect her sister, putting herself on a collision course with unseen threats.
006
A man known as Grand Supreme orders his subordinate to arrive at his sister Lyra's engagement in ten minutes, concealing his true power by posing as a normal mage. The subordinate vows to get there even by ripping through space. Elsewhere, Lyra boasts about Lord Reynold's impending arrival, while a skeptic refuses to believe Reynold would ignore the heir to the firehouse. The episode sets up a tense race against time and conflicting expectations for the high-stakes event.
007
A man observes a woman named Iris, whom he grew up with in poverty, and doubts she could secretly be the legendary Grand Supreme. His suspicion is triggered when he sees her enjoying a cookie, remembering their shared past fighting for copper coins. However, gossip spreads that a powerful crystal belonging to Lord Reynold has activated, a sign the Grand Supreme is present and watching over them, casting new, confusing significance on the woman he knows.
008
Lyra prepares to have her sister, a family disgrace, discreetly removed from the estate before the arrival of Lord Reynold, a powerful Grand Lightning Mage. A man named Dylan angrily accuses her of crossing a line. Despite the urgent plans, Lord Reynold arrives unexpectedly, forcing a confrontation and exposing the family's internal strife just as Lyra sought to conceal it.
009
Lord Reynold encounters a woman being insulted as a 'beggar mage' by another man. The woman confidently greets Reynold by name, revealing she is here for her sister's engagement. She then instructs him to observe how the bride's family is managing the event, establishing her authority over the lord and shocking those who had belittled her.
010
Iris and Lyra are sisters from an ordinary mage family. Unbeknownst to Lyra, Iris is the legendary Grand Supreme, her power sealed and hidden to protect them from Abyssal threats. Lyra's dream engagement to Dylan, heir of the Fire House, shatters when he publicly humiliates her, aided by the prodigy Chloe. Witnessing her sister's despair, Iris unleashes her dormant stardust magic, defeating Chloe and stripping Dylan of his power in a shocking display. Iris then reveals the truth: Lyra possesses the ancient Wind God Bloodline, the key to defeating the Abyss. Together, the sisters awaken this power, expose Dylan's betrayal, and survive relentless assassination attempts at their academy. They ultimately unite to thwart the Lord of the Abyss's invasion, with Iris ascending as the revered Grand Supreme and Lyra growing into a mighty Wind Magus, forever each other's strongest ally.