You/Joo Hyeyi- 16 year old girl who never smile since her best friend (which she had crush on), Chanyeol, always changing girlfriends. She's afraid to tell Chanyeol that she likes him because she was afraid that Chanyeol might reject her and will broke off their relationship as a best friend. That's why she had to pretend to be cool in front of him even though she was hurt inside.

Chanyeol-16, Hyeyi's/your childhood friend. He had a crush on you since both of you were young but only you who didn't notice it. The reason he'salways changing girlfriends is he wants to know what's your reaction. By that way, he'll know whether you likes him or not.