13 years ago...

Park Sandara was 12.

The two girls finally met each other when Chaerin moved into the neighbourhood from France. She was like a foreigner in her own country. Despite being fluent in English, French and Japanese, she wasn't very good at her main language. The kids avoided her initially because of their fear to communicate in any other language other than Korean, hence she was always alone. Left in the dark. No one offered her a place in their own little group. 

Now...

Park Sandara is 25.

Lee Chaerin is 20.

Time passed, people changed, Chaerin remained troubled. It seems like her favorite unnie / best friend does not grow up. Forever young, in terms of looks and personality. Unlike any other young women of their age, Dara does not think about love. This is a problem. They are always together, almost 24/7. Now that Chaerin has found someone that she wanted to be with, she will MOST PROBABLY be spending lesser time with her. 

With that, a plan was carefully devised. To find a partner for her dearest sister.

"This is to repay your kindness you showered on me when we were young, I love you Dara-unnie."