Yoo Hye Jung, a rebellious teenager, ends up in the care of her grandmother. She doesn't back down from anyone, whether adults, another youth, or even gang members. Unfortunately, she butts heads with Professor Hong Ji-Hong who turns out to be her new classroom teacher.

Seo-Woo's jealousy leads to drastic events and destroys the friendship bonds. Soon-Hee stays loyal to Hye-Jung. Kang Mal-Soon, Hye-Jung's grandmother, goes in for an operation. Ji Hong tenders his resignation as a teacher.

13 years after the big rift, Hye-Jung transfers to Gul Il Medical Center as a Surgeon. Although happy to reunite with her friend, Soon-Hee, she is not welcomed by everyone. She starts off on the bad side of Dr. Jung Yoon-Do and some old enemies.

Ji-Hong and Hye-Jung have a sparring match and later confesses his feelings to her. Director Myung-Ho plots to maintain and solidify his control over the hospital. Hye-Jung discovers a suspicious person.

Hye-Jung asks Ji Hong to retrieve a patient's file that she does not have access to. Hye-Jung is surprised by a new patient. Ji-Hong steps up his courtship game.