The siblings woke to the gentle chirping of unfamiliar birds, a sound that had become a comforting part of their new morning routine. They dressed in their crisp black uniforms, feeling a sense of belonging as they put the silver emblems on their chests. The house was quiet, almost eerie in its perfection as if it had been waiting for them to breathe life into it once again.

They collected the device and books given by the princess, sensing the gravity of their new duties. The device, a compact and sleek crystal, vibrated softly, projecting holographic images and data about the serein and its characteristics. The books were venerable volumes brimming with lore and knowledge of Ondur. After studying and eating, they went to Ondur.

"You ready?" Si-Woo turned to Ha-Yoon, his eyes reflecting the nervous excitement bubbling inside him. Ha-Yoon nodded firmly, gripping her T-crystal tightly.

They stepped out of the house, the cool morning air kissing their cheeks as they made their way to the portal. The gravity of their new profound life weighed heavily on their young shoulders, but they were determined to face whatever lay ahead. The portal shimmered in the early light, a gateway to a world that was both strange and somehow comforting.

Holding hands, they took a deep breath and stepped through the shimmering veil. The sensation was like diving into a pool of cool, clear water, a brief moment of weightlessness before their feet found purchase on the solid ground of Ondur. The world was as they had left it, unchanged by the passage of time, yet everything felt different.

The air was cleaner, the colors more vibrant, and the very earth beneath their feet hummed with a palpable energy. Ha-Yoon looked around in wonder, her eyes drinking in every detail. The once barren landscape was now dotted with floating islands, lush with life and bustling with activity.

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"This will never get old," Ha-Yoon murmured to herself, her voice filled with awe.

Si-Woo nodded in agreement, his eyes wide with wonder as they took in the view.

"Let's get going," Ha-Yoon said, her voice filled with excitement. "We've got a lot to learn."

As they approached the path of the Mu's, Si-Woo spotted a figure standing in the shade of a tree with a familiar Large dark figure behind it, watching them. As they drew closer, the figure stepped out into the light, revealing Minho with a knowing smile on his face.

"Minho!" Ha-Yoon exclaimed, her eyes lighting up with relief and excitement.

"Yes, I see you two have settled in nicely," he said, his eyes scanning their uniforms and the books tucked under their arms. "But there's something I need to discuss with you before we head to the academy."

The siblings exchanged puzzled glances. "What is it?" Si-Woo asked, his voice filled with a hint of trepidation.

Minho's smile faded, and he grew serious. "You both have a great responsibility now, as great pure serein bearers." He paused, letting the weight of his words sink in. "And there are those who would seek to use you or your powers for their own gain."

The siblings nodded solemnly, understanding the gravity of their situation. "We know," Ha-Yoon said, her grip on the T crystal tightening.

"Good," Minho said, his smile returning. "Because I have a surprise for you." He snapped his fingers, and the air around them shimmered, fully revealing the majestic black and silver wyvern, its eyes gleaming with intelligence. "Tomorrow, after school, I'm going to personally train you in combat arts so you will be able to take care of yourself." He said proudly.

The siblings looked at each other, their excitement building. "Thank you, Minho," Si-Woo said, his eyes shining.

"But why not today?" Ha-Yoon asked, her voice filled with eagerness. "We're ready to start learning now."

Minho chuckled, his eyes twinkling. "Patience, young ones. After classes today, I have other plans for you. Now, let's hurry to the academy," he said, urging them forward.

They rode on Lemmy, the majestic black and silver wyvern, to the city of Ondur. The creature's wings beat rhythmically, slicing through the air with the grace of a dancer. The wind whipped through their hair as they soared over the floating islands, the city growing larger with each passing moment.