Shui Nan (2009)

Will, a young psychotherapist, one day meets a strange patient, who calls himself 'water man.' During the treatment session, Will discovers water man has a bizarre experience when he was a child. On the other side, Will's daily life is getting worse. He loses his job and his love as well. It seems these misfortunes have a connection with Will's weired patient, and, what is worse, he begins to lose his perception to reality.