Story background : Yerin and Sinb are in the same university and same dorm.

"Yerin, your fever still hasn't gone down, stay at the dorm and rest." Sowon ceased her brow and retracted her hands from Yerin's burning forehead. "I'm really okay, unnie." Yerin said weakly to Sowon while tying her shoelaces. "If you say so." Sowon sighed at the hard-headed girl. Out of nowhere, Sinb suddenly appeared and walked past them without saying anything. "Yah Sinb, don't you need to greet your unnies before you leave?" Sowon snapped at Sinb who was about to leave the dorm. Sinb didn't even care to turn around, she just shrugged and walk out of the door.

"Aish, that girl really has no manners." Sowon mumbled and opened the door for Yerin. "Wait, you're going to the same class with Sinb later right?" Yerin nodded and gave a questioning look. " If you're not feeling well, call Sinb to bring you back here." Sowon patted Yerin and said. The latter nodded but her mind said otherwise. "That cold girl wouldn't even care even I fainted in front of her." She thought in her mind.

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On the way to her class, Yerin felt a strong wave of dizziness on the way to her class but still managed to arrive at the end. There were only a few students who had arrived including Sinb who is currently sitting at the corner of the room playing on her phone. Yerin sat on her usual seat and started reading her notes. After 10 minutes of studying, Yerin couldn't handle the pain in her head and stopped reading. She rested her head on the desk and dozed off shortly after. 

Sinb noticed and was curious why the most intelligent student of the class was sleeping instead of studying as usual. She suddenly remembered the short conversation between Sowon and Yerin and finally understood why Yerin looks so tired. 

The professor came in shortly after and greeted the students. He saw that Yerin was sleeping and called out her name. "Miss Jung Yerin, it's time for class and you're still sleeping? Why don't you go back to your dorm instead of sleeping in my class?" Yerin woked up instantly and stood up from her seat. "I...I'm so sorry professor." The professor nodded impatiently and signalled Yerin to sit down. "If anyone alse wants to sleep during my class, I'll be glad to give you a failed grade ." The professor stared intensely at poor Yerin.

"Yerin ah, are you okay? You seem a bit off today." Yerin's classmate asked worriedly. Yerin nodded and smiled weakly at her classmate. She was acutually feeling worse and worse by every seco