An employee at a children's facility, Cha Woo Kyung serves as a child counselor. Her life appears to be ideal because she is married to a wonderful man and is expecting a child. Her idyllic existence, however, is short-lived due to an accident. On her way back to the station she encounters Kang Ji Hun, a detective who is tormented by disguising his history, but who thinks that offenders should be punished to the fullest degree.