Who Is Who? (2001)

A shy acupuncturer discovers a secret: His needles are not only healing his patient, but punched to the right place, they open up his body - and it's hollow like an empty suitcase! Our hero can't resist and slips into that new envelope. Being now unrecognized he feels like a self-confident superstar and is experiencing several amusing adventures. But then he finds out about him being not the only one knowing this extraordinary secret. What if there's always somebody else hidden inside everybody? Who might be "living" in his own body? He starts an experiment...