Son Chaeyoung is really cheerful and adorable as hell. 

But Chaeyoung is quite shy. 

Everyone loves Chaeyoung and everyone is her friend but she doesnt have a "best" friend. Until Sana came in to her school last week. 

They're both super cheerful and outgoing so they get along very well. Chaeyoung finally feels comfortable with Sana and now talks to her without

being shy or embarrassed. But Chaeyoung will always be shy. 

At her luck, Charyoung and Sana are neighbours so they walk/ride the train to school and back together. 

One day when she on the train with sana, people were pushing chaeyoung around quite harshly in the busy train.Chaeyoung closed her eyes shut

because of the fear haunting her that she was gonna get pushed out of the train and die when the next stop came. But someone came around and

held onto her, when the next stop came. 

She first initally thought it was sana so she didnt push away. She let go of "sana" when the train seemed to calmed down. 

When she opened her eyes she realized that sana was on the other side. So Chaeyoung ran to sana and asked about the mysterious girl who saved her. 

And the girl was 

Tzuyu. 

So from then on, chaeyoung became a fond of tzuyu and decides to find out more about Chou Tzuyu.