In a small town, an auto mechanic named Benny is devoted to taking care of his mentally ill sister, Joon, who can barely function alone in the real world despite being a talented artist. This relatively stable situation is shaken up when Benny is obliged in a poker game to welcome another player's relative, Sam, to his home for a few days. When Sam arrives, he quickly makes an impression with his quietly eccentric ways which emulate the antics of the great silent movie comedian, Buster Keaton. Without Benny's full knowledge, Sam and Joon find themselves drawn to each other to the fullest degree. However when Benny finds out, it creates a rift in the siblings as they struggle to accept their relationship is profoundly changing with the presence of this odd newcomer.