She couldn't get over with this guy. She thinks that her pain is her gain. 

The guy that she likes never liked her, but he pretends to like her. Why? Because she's pretty. 

She's hurting ever since they're going out. She always told him that she was okay, but when no one's around her tears fell. 

Her best friend, Baekhyun saw all this but can he keep his feelings inside? He's always been there for her, but she doesn't take him seriously.