Sohee is a high school student focusing on a job training education. Hoping for a good job, Sohee starts an job training at a subcontracted call center, but she faces big pressure of greedy company. It is too hard for high school student to bear this situation and it leads to her death. Detective Oh Yu-jin, who has something in common with Sohee, becomes in charge of this case. She starts to follow traces to reveal the causes of her death.