Kim Myungsoo

-22 years old

-an autistic and hyper-active boy

-have an immature thinking way

- younger brother to Sunggyu

Lee Sungjong

-20 years old

-a 'cold' boy and easy get angry

-Sunggyu's employee

-have to take care of Myungsoo after Sunggyui transferred to Japan

Kim Sunggyu

-24 years old

-Myungsoo's elder brother and family member

-will be promoted and tansfered to Japan new workplace

and another Infinite members as cameos