Hyuna and Luka had been friends since elementary school. Hyuna was a very confident, sure of herself, strong and extrovert girl while Luka was cold and would barely talk people, even if he had girls oftenly trying to flirt with him as he was a very pretty boy, but he always rejected them or simply ignored them, as he didn't like them. He also couldn't do much sports as he had a not mortal, heart disease causing him to be weaker and more easily tired than other people his age but he was stubborn and still decided to push himself off limits, wich caused Hyuna to oftenly have to drag Luka to the nursery. And somehow, they were best friends. As time passed, Luka started developing feelings for Hyuna, he never directly say or show it but he did acted way more possessive about Hyuna. Even getting overprotective with her, even if she was way stronger and taller than he is. He also acted jealous, not liking Hyuna's other male friends or classmates, trying to spend more time with her then them. But, everytime Hyuna would ask him if he had something he'd like to tell her he replied no.

One day, Hyuna and Luka had a big argument because of how jealous and stubborn Luka was. The day after the argument, Hyuna totally ignored Luka wich made him sad and worried he might've lost her best friend because of an argument. So, after the day, Luka searched for Hyuna all around the school, trying to find her. When he realized she already was going home and was probably far away he didn't give up. Instead, he started running to catch up to her, he knew it was bad for his heart to do that but he surpassed his limits to see her anyway. When he was finally catching up to her, he quickly grabbed his hand to make her stop her walk. Hyuna turned back to see Luka, sweating, his breath quick and deep, almost all his body trembling. He looked like he could pass out at any moment.

"H-hyuna… w-wait… I'm… sorry…" He mumbled, hus breath heavy but he couldn't care less and focused on apologizing and getting Hyuna's attention back.