Yonghwa and Seohyun <3
Although Yonghwa is obviously slowly falling for Seohyun, Seohyun looks like she's doing this as a job. But this show is definitely showing Yonghwa's playful side - it's easy to see how so many girls fall for him.
Seohyun's different though. She doesn't fall for guys easily. although sometimes, you can never know if what you're feeling is real or not.
Seohyun's this naive, innocent girls who loves books and was never in a relationship before.
Yonghwa's a rocker from heart, have many dating experiences and knows how to play with a girl's mind.
...should I write a fan-fic for this?