Shim Hae Rin is your avergae girl with a normal life. She moved to a new school, hoping to have more friends. Unfortunately, it seems that luck isn't on her side this time as well. Just as she was about to give up, someone came to her aid. Lee Eunhyuk. He was the first person to EVER talk to her since she started going to this new school. And in just a short period of time, they became the best of friends.

One day, Eunhyuk finally wanted Hae Rin to meet his other best friend. Lee Donghae. Hae Rin was more than delighted to learn that she would have another friend. But as the two met, something seemed... off. Instead of greeting her back, Donghae forced a smile and brushed her off, talking to Eunhyuk only. Hae Rin was confused and hurt by Donghae's actions towards her. What's worse is that Eunhyuk was completely oblivious to it all.

Will Donghae finally accept Hae Rin and eventually... fall for her? Or will he always see her as a pest that needs to be eliminated?