Mi-Soo (Han Hyo-Joo) is a doctor with a fiery spirit. Unfortunately, her fiery spirit gets the best of her one day at work. Mi-Soo fails to properly diagnosis an ill woman, after she sees the ill woman's husband, whom she assumes to be an abusive thug. Because of Mi-Soo's failure to diagnose the woman's illness, the woman is now hospitalized and near death. Her husband sues the hospital and Mi-Soo is advised to find a character witness.
Kang-il is a rescue firefighter whose wife died while he was helping someone else in an accident. Struggling with guilt for being unable to save his wife, Kang-il frantically jumps into dangers to rescue others. In danger of losing her medical license, Mi-soo’s lawyer advises her to convince Kang-il to testify against the patient’s husband for an assault that occurred while the husband was in grief. She sets out to win Kang-il over. However, Kang-il is not one to fall for Mi-soo’s schemes and gives her the cold shoulder. As a last attempt to win him over, Mi-soo volunteers to be a paramedic to work alongside Kang-il.