A kid's imaginary friend turns out to be something wearing a human face. The mask doesn't grant powers, it reveals what was always there, waiting in the reflection. Nube movies understand that the real horror isn't the supernatural object, it's the loneliness that makes you want to put it on in the first place.

A new transfer student named Jun arrives at Nube's classroom carrying an unusual obsession: clowns. His isolation from other kids has left him with only one companion, a mysterious Pierre who exists solely within a mirror. At school the other students torment him, taking his belongings and filling his shoes with sand. One night the clown in the mirror hands Jun a mask with strange abilities, and suddenly he can stand up to his tormentors and even wins popularity among his classmates. Soon Jun begins acting oddly, and a string of accidents breaks out around the school. What the mirror clown truly wants remains the central mystery of this supernatural horror comedy film.