Upstream(2012)

Set in a rigid, harsh school environment, a male student still tries to break away from rules and to live his own way. His motivation comes from a mysterious female friend, who always stays in the dark but her rebellious spirit is vigorous. The girl’s way of talking, behaviour and indifference to rules and warnings from the school authority intrigue him. However, a big incident happens, the teenage boy suddenly realizes the truth behind this strange girl.