Kim Ji Min (You) who have a short hair and have a tomboyish personality. 

Her two best friends are Choi Minho and Lee Hyun Woo.

After school the three of them will play baseball on the field.

But Ji Min have a class duty to do. She need to clean the classroom for the day.

As she cleaning the classroom alone she found something. Something that look like a acorn. 

As she craked the acorn she was dizzy and faint. 

As she woke up Hyun Woo saying that Ji Min were faint.

Ji Min was curious but after a minute she already forgetting about it.

Riding a bicycle on the down hill and just realized the bicycle's brake was broke! 

The train is about to COME! Will Ji Min stay alive or die?

✎Main Characters ♥