Why did Felix leave the orphanage Once by Morris gleitzman?

Felix left the orphanage in "Once" by Morris Gleitzman to search for his parents, whom he believed were still alive. He was determined to find them despite the dangers posed by the World War II setting. Felix's quest was driven by hope and a deep-seated desire for family and belonging, prompting him to venture into the uncertain world outside the orphanage. His journey symbolizes the resilience of the human spirit in the face of adversity.