Elizabeth (Cameron Diaz) is an out-and-out bitch in life, but at the same time she has another identity-the people's teacher. After being abandoned by her ex-boyfriend, she had to return to her job that she hated and slack off. She has always been dissatisfied with the size of her breasts. This time, she finally made up her mind to do breast augmentation surgery, but before that, she had to get the expensive surgery fee together. The new teacher Scott (Justin Timberlake) appeared in Elizabeth's sight. His young and handsome appearance quickly attracted her attention, but the bad thing was that her colleague Amy (Lucy Punch), who was friendly on the surface but sinister in her heart, also sent him a glance. Scott and Amy are together, which makes Elizabeth very frustrated, but Russell (Jason Segel), the physical education teacher who has been pursuing Elizabeth, seems very happy about this. Elizabeth, who was robbed of her love, put all her energy on making money. She learned that if the class's test scores are among the best in the state, she will receive a bonus of $5,700 as the head teacher. This news cheered up the depressed Elizabeth, but at the same time, the disappointing children in the class made her have crooked ideas about the answers to the test paper.