It started twelve years ago. Minju was a freshman in College, while Chaewon just got her heart broken by her failure. 

Minju wanted to be a lawyer, and spoiler alert, she is a lawyer now. A very successful one, sought-after. 

Chaewon who failed the NMAT the first time is now a neurosurgeon. 

Both Minju and Chaewon faced failures, and successes together. They were there for each other. So why is it that they are talking about breaking up? Are they unhappy?