They have known each other for more than a decade. She was the school's delinquent and he was the cheeky class clown. They were best friends since their diaper days. He was there to cover her whenever she needed to ditch school or escape from her parents. He was basically like her superman, to save her when she is in trouble. 

Still, everyone has to grow up. 

She graduated from high school and moved on to further studies in England at Oxford. 

He too graduated and moved to Seoul for his further studies.

Seven years later, they meet again.

From a high school delinquent, she transformed into a successful powerful lady. She excels in her career as the accounting manager in her department and is studying to get her Masters done. 

He used to be the class clown, now he graduated from Seoul National University with first-class honours, and is a resident doctor working at Samsung Medical Center. 

All grown up, will feelings between the two friends change? 

Or have they forgotten?