What makes you fall in love with the opposite gender?

Appearance?

Money?

I am certainly sure that the options above are not the answer but the interest that the both of you share. 

Lee Doyeon just entered the most popular and hardcore university in Korea, Seoul National University. This clearly showed that she was really, extremely intelligent. Well, there were people that weren't that smart too, but overall they were still good. Being a pretty and studious girl, Lee Doyeon didn't actually behave like what she looked like physically. She was completely the opposite. She played online games, watched anime and read Japanese manga, a complete 'otaku'. Although, she was a little odd for a girl, she was still a girl after all. The campus prince, Oh Sehun, fantasized by almost every girls in Seoul National University caught Doyeon's attention too.However, only his appearance that caught her, nothing much. Doyeon wasn't someone that would be easily attracted and seduced. This is why, she hadn't had any boyfriend for 19 years.