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Kim Ji Su is a 31-year-old single woman who once wanted to become a famous pianist like Horowitz. Her dream was shattered but she was able to go on by teaching children to play the piano. One day, she discovers a young boy, Gyung Min, who is a musical genius. She starts to give him intensive music lessons, preparing him for competition, but it does not turn out well. But later, when all seems lost, Ji Su is utterly shocked when she realizes that Gyung Min carries a secret that will change her life forever.

A long time ago, the Earth was plagued by the Demon King Beasts, monsters that wreaked havoc across the globe until the Ultra Warriors sealed them. Time passes... To protect the Earth from the revival of Demon King Beasts, Ultraman Orb descended from beyond the galaxy, taking the form of young traveler Gai Kurenai. In order to defeat the resurrected Demon King Beasts, Gai utilizes the Orb Ring and a pair of Ultra Fusion Cards.