Henry Bachter (Adrien Brody) comes to the community school as a substitute teacher. The school is on the verge of collapse due to student rebellion and poor management, and a group of teachers led by Doris (Lucy Liu) are suffering. Henry encountered provocation from naughty students in his first class, but he cleverly resolved it. He won the favor of the female teacher Sasha (Christina Hendricks). At the same time, his teaching method aroused the interest of his classmates, including Meredith, who was depressed because of obesity. She has been silently enduring all kinds of scolding and ridicule caused by her weight. But because of the teacher, she seems to have found a reason for everything... However, Henry actually has a lot of pressure in his heart. His grandfather is dying, and the shadow of his mother's suicide is always lingering in his mind. One night, he was sad and crying alone on the bus. This situation was seen by Erica (Sami Gayle), a young prostitute who had just been abused by a client. She followed him, hoping to get his help. He initially rejected her request, but later he took her back to his bachelor apartment...