Jinri was once a nice and sweet person. But now? She was the opposite person after what had happened when she was in middle school. It was like a big glass was lifted and broken into pieces. Her sweetness and niceness had escaped that glass it was once in. Jinri was not the same person as she used to be.

Everybody was scared of her, but they continued to be mean to her. Jinri didn't care. She will be mean back. Jinri, constant troubles and 'accidents'.

Tao knew how Jinri felt before. He was once that person until he entered high school. He didn't want anyone else to be in that position, again. Specially to the one he cares about and loves. 

¦ Zi Tao - Nine-teen years old, the most popular in Seoul Arts Academy. His close friends call him Panda. He likes to dance and do taekwondo. Tao was not the popular one in middle school, but the girls would still date him. The girls that dated him, was just playing with his heart. That time, his glass was broken. Until  high school. When she came into his life, that glass was back in its place. He wanted to help her. Help her fix that broken glass of hers. Even though she never noticed him, he still wanted to help.

¦ Choi Jinri - Eight-teen years old, the least populat in Seoul Arts Academy. Sulli is what her close friends call her. Jinri shares a similar past as Tao but never noticed him. Her past in middle school was the worst school year for her. Boys dated and broke her heart a dozen times. Later then, the glass was broken. She wasn't the same as she was in middle school. Wasn't nice nor sweet as the same Jinri. Some of her friends had left her but some remained. Jinri didn't pay attention to them.