"So you've caught a ghost..."
Armed with a newly invented device called the Menger Sponge, a team of scientists - led by enigmatic Hashimoto - captures the energy of a ghost child.
This child, isolated in an empty flat, moves his lips to words no one understands. In an effort to learn more about the ghost they enlist special agent Ye Qi-Tung who's able to read lips.
Special agent Ye is part of the JCCU (Joint Crime Crackdown Unit) and is gifted with extraordinary powers of eyesight. Ye accepts the assignment when he realises that this is an opportunity for him to learn about life after death and perhaps to find clues of his own dying mother who's suffering from ALS (Amyotrophic Lateral Scierosis).
In order to learn more about the ghost child's background they set the ghost child loose for Ye to follow...