The world well-known violist Richard Yongjae O’Neill gets a proposal of a project called ‘HELLO ORCHESTA’. A youth orchestra with foreign children lives in Korea. Those children are usually having hard time to find their identity if they are a Korean or foreigner. Raised by Korean mother who had been adopted, Richard experienced similar heartbreaks and now he thinks this can be the great chance to heal the children with music. On the first day of their meeting, Richard waits for them with exciting heart. But regardless Richard’s expectation children are not welcoming him and start to call him a ‘monkey teacher’. Will he be able to lead the harmonious journey safely with those little evil angels?