Erin (Hilary Swank)'s first job as an educator was as a teacher in a terrible class at Wilson School. There are students who bring nightmares to teachers: they waste time and regard school as a playground before the age of 18; what's more chaotic is that students come from different races and various lower classes in society, and they fight each other in gangs. Erin tries every means to keep hatred away from the children's hearts and eliminate the hostility between them. However, as a white teacher, the children have built a lot of walls around her, and Erin's educational ideals have hit a wall again and again in reality. Are the children's hearts that have fallen into the abyss hopeless? Can their future be revived under Erin's guidance? Erin has a heavy burden on her shoulders. She only has a copy of "Anne's Diary" that may influence the children, and a warm and sincere heart to lead the lost children to find the light.