Haneul, Ye-rim and you had been friends since childhood, the three of you lived in the same neighbourhood and often played together as kids. During middle school, Haneul and Ye-rim got together. With you having feelings for Haneul, you buried it deep and hid it from them, you didn't wanna hurt Ye-rim. Even if it hurts for you to see them together. Haneul and Ye-rim grew oblivious to your feelings for Haneul.