Sunhee is a an ordinary high school girl,but there's something that makes her different compared to other high schooler...

She has a 'imaginary friend' that she once told everyone that his name is 'Myungsoo'...

She claimed that she can actually sees him and she always talked to him...

But sadly,no one believes her...

Her brother,Kevin and her childhood playmate,Woohyun neither,they doesn't believe her...

They think she was just too stress about her studies and so she started to imagine things that aren't real...

They try to convince her that 'Myungsoo' doesn't exist and she started to believe that...

But soon,her nightmare started,that's when 'Myungsoo' started to haunt her....

What if she started to see more things and hear more things that shouldn't be seen or heard....