12 years ago: 

"Oppa!" Yoomi ran over smiling a toothless grin as her puffy pony tail swung back and forth. She quickly sat next to Yi En on the edge of the sandbox.

"Hey Yoomi!" He flashed her one of his killer smiles as he stopped making his castle.

"Oppa! Oppa!" Yoomi's voice echoed throughout the empty playground. 

Yi-en quickly covered , then scanned the area, "don't be too loud or teachers will hear us and make us take our naps." Yoomi smiled. He slowly removed his hand and excitedly nodded. 

"Oppa..." she looked down and fumbled with her thumbs, "promise me something?" Yoomi looked up at him with her puppy dog eyes. She's finally going to ask the question she had been struggling to keep it to herself and decided rather to just ask him or not.

"Sure, what is it?" Yi-En's face got tense, although he was only 6 years old, he knows quite a lot and is very mature for his age.

"Oppa, promise me..." she spoke, "that you will never leave me okay?" she asked the question. Yi-En looked at her curiously for a few seconds and let out a cute chubby faced smile. 

"I promise I will not leave you. And that I, Tuan Yi-En, will promise to marry Jung Yoomi when we grow older."

He gave his little speech, quickly blushing at the meaningful words and quickly looked at Yoomi.

"Pinky promise?" She held up her pinky instinctively, waiting for his pinky to interlock with hers.

He locked his pinky with hers, with no hesitation.

Yes, they are skipping nap time together. This has been going on for quite some time now and most of the time, they would get caught by one of the teachers. They were at the playground playing around with each other. Their innocent first love, but what would happen if the promise that they kept for a while is now broken? Will they be able to connect with each other again?