Jeongyeon's best friend, Chaeyoung, is stranded in an airport due to unforeseen circumstances, thus keeping her from executing her plan to stop the wedding of her ex-girlfriend, Mina, with whom she's still very much in love. Chaeyoung asks Jeongyeon to stop the wedding for her and that's how the That girl meets Nayeon, Mina's best friend and maid of honor. A Camren conversion

Yoo Jeongyeon, transfer student, gets entangled with Im Nayeon, the Principal's daughter. - Getting to safety was new territory for Jeongyeon. She's never really felt safe anywhere. So when she meets Im Nayeon and struggles to keep up with her old life and her new one, will things end the way she wants and receive the love she's always needed? Or will it be Nayeon who loses everything?

"It was a nuisance, this shouldn't be happening. I hate her, she's annoying, too clingy, too handful.Yet she helped me.." She muttered,"But that days are too short."

A story of a carefree girl with a rare heart condition meeting a arrogant doctor that will both change there life. With SaTzu, MiChaeng, DahMo, God Jihyo and 2Yeon.

If there are things that the campus crush a.k.a Yoo Jeongyeon would be willing to learn, that would be the How's to Im Nayeon's heart, but would the number one student Im Nayeon learn the basics of love, before things fall apart?