The Bat (2009)

A middle school boy 'Kwak' adores 'Chul-woong' who can beat down every kid in the neighborhood, a symbol of power. Kwak has an old friend called 'Darky' who raises bat. His face is so dark that Chul-woong always makes fun of him and bullies him with a black plastic bag. Becoming complicated between his friend Darky and Chul-woong, Kwak finally chooses to stick with Chulwoong. One day, Darky rages against Chul-woong. He sneaks into the empty classroom and breaks the Chul-woong's billiard cue that he has always carried with. Kwak accidentally witnesses that and tells on to Chul-woong. Next day, on the bus, where they've always met together, Chul-woong comes up with the face bruised, and Darky never appears. Suddenly, a bat flies into the bus, causes a disturbance.