How do you know when you have fallen in love?
Well,For Lee Yeon Joo's case, her heart skipped a beat.

Adopted and raised by her foster family, Yeon Joo has a rebellious attitude and was notorious for skipping classes. Despire that, she had never dated anyone because she found guys to be shallow people. 

However, all these changed when she was confronted by a certain someone - his brother's best friend.

Her heart skipped a beat. And that was how she knew she had fallen in love.

How would things turn out? Well, read on!