It's said that you only use 10% of your brain. What would happen if you could use all of your brain power or even half of your brain power at once. Lee Jong Suk is a leading specialist in neurology. He studies the brain, the thing that makes a human a human day and night, fascinated by what makes everything in your body work. When he runs across a girl with what seems to be access to her whole brain he thinks now he can finally make sense of what's been evading him this whole time. 

Only the catch is she can't talk and appears to have the mental capacity of a child.