A pair of sisters, Chaeyeon and Chaewon, end up finding out that their close friends, Haneul, Noeul, and Yiseul, run in different circles. Yet that doesn't change the friendship between them. It just changes with the duo hanging out with the trio as their friends drag them to events and what not. Eventually, the sisters find themselves working for their friends' friends and a type of love journey begins for them.

I want to be your oppa Why don’t you know my heart for you? Even if you ignore me