My Sister is the Grand Supreme

Iris and Layla are sisters from an ordinary magical family. Iris is secretly the legendary Supreme Master of Ancient Celestial Magic, but after being sealed by the Lord of the Abyss, she has recovered only thirty percent of her power. To protect Layla, she hides her identity and lives as an ordinary mage.

Layla loves Dylan, heir to a fire family, but he is secretly involved with Chloe, a water mage. At their engagement banquet, Dylan breaks the engagement while Chloe humiliates Layla. Seeing her sister bullied, Iris reveals her power. Ancient celestial magic overwhelms Chloe and destroys Dylan's abilities—stunning everyone. Iris sets out to protect her sister and reclaim her place. She reveals that an ancient Wind God bloodline lies within Layla—the only force to defeat the Abyss. Iris awakens it. Together, they expose Dylan's betrayal, survive assassination attempts, and thwart the Abyss's plot. In the end, Iris becomes the supreme mage revered by the four great families, and Layla rises as a powerful Grand Wind Mage. The sisters stand together—each other's strongest strength.