D.O is a good kid but when he meets a new girl. What will happen??....

Characters:

Niya:
A sister to Kyungsoo but isn't really a sister.

Do Kyungsoo (D.O):
A brother to Niya and a good person until...

Park Jae Hyun:
The new girl who arrives at D.O's school. She's a crazy person.

Taehyun:
D.O's best friend who ends up at the hospital.