Donghae and Jessica had been the couple that people envied. They had been together for a year and had been together through up and downs. He loves her and she loves him. But often, the people around them don't always like them being together, particularly the new girl in school, Im Yoona. It seems as her presence has changed many things, one of which is the love Donghae has for Jessica. On the other hand, Nichkhun is trying to protect Jessica from all possible harm but it seems like he's going to change the love Jessica has for Donghae. Well... The cupid's arrow going to break...