A recalcitrant, delinquent teen girl meets a compassionate teacher, who inspires her to alter her path and become a street-savvy neurosurgeon.
Prior to becoming a doctor, Yoo Hye Jung was a rebellious teen, always ready for a fight. She meets Hong Ji Hong, a teacher at her new school, and the two immediately butt heads.
Hye Jung is inspired to turn her life around after witnessing Ji Hong's medical expertise. With midterms approaching quickly, she must find a tutor to help her study.
Hye Jung takes on more blame than she should after the abandoned building fire. Ji Hong is met with consequences of his own regarding the photo scandal.
Back in the present day, Hye Jung is a neurosurgeon starting her first day at Gookil hospital, where she quickly runs into a familiar faces. However, not everyone is happy with her presence.
Ji Hong confesses his feelings to Hye Jung. Director Myung Ho schemes to keep the hospital under his control.
Hye Jung asks Ji Hong to help access her grandmother's files. A new patient arrives whom Hye Jung would rather not treat.
Seo Woo finds herself in a familiar situation as she catches on to Yoon Do's new crush. Ji Hong is assigned a high-profile patient.
When Seo Chul is badly injured, Hye Jung must decide if she'll assist in the risky surgery. The staff holds a wild party in Sooni Hawaii.
Adamantly seeking revenge, Hye Jung takes new steps to unveil the truth behind her grandmother's death. A loved one's health scare puts Ji Hong in a fragile state.
Director Hong surgery approaches, but its secrecy begins to dissolve. Hye Jung's burden of a new car becomes an even bigger problen.
A new doctor joins the General Surgery team. A distraught husband brings his wife to the hospital after she is severely injured.
Hye Jung is unsure of how to act upon Ji Hong's return to the hospital. Jo Soo Ji tries to get a message across to the doctors.
Ji Hong examines a limping child, but there may be more to discover. Hye Jung receives a very unexpected offer.
Hae and Dal's father struggles to afford his sons' medical expenses. Hye Jung and Ji Hong become more comfortable with one another.
Seo Woo is fed up with her father's expectations. A loving couple ends up in the hospital on their wedding day.
Congressman Na won't give Hye Jung a moment of peace. Kang Soo's own lack of peace begins to threaten his health.
The dsiciplinary committee meets to decide on Hye Jung's punishment. Kang Soo must choose which surgeon he wants to operate on him.
With no legal options available, Hye Jung must find a new way to get revenge. Ji Hong and Tae Ho try to unveil Director Jin's secrets.
Seo Woo has trouble coping with the truth about her father. Meanwhile, Director Jin has trouble coping with the stress of everything falling apart around him.
In the series finale, Director Jin must undergo risky surgery at the hands of Ji Hong, who wants Hye Jung to assist. But will she agree to save the person she's sought to destroy for 13 years?
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