Seo Hye Jin, a star instructor, stays late at the academy. Jun Ho's name on the Hall of Fame reminds her of her proudest student. Meanwhile, Jun Ho quits his job to become a rookie instructor.
Joon-ho completes his demo lecture and tells his parents that he quit his job. Hye-jin is conflicted about Joon-ho's decision to teach at the academy. Joon-ho and Jeong-mi are hired as academy teachers.
Joon-ho pitches the idea of teaching a shared class with Hye-jin. An ad campaign is released featuring Joon-ho and Hye-jin, provoking competition from a rival academy.
The academy decides to divide Hye-jin's students with the new teachers. She considers switching to a rival academy. Hye-jin and Joon-ho recruit their first student from a high school where a rival academy is dominant.
Hye-jin reconsiders her life goals. After drinking too much Hye-jin confesses to Joon-ho, and they go on a first date. Joon-ho moves out of his parent's house.
Pyo Sang Seob Hye-jin becomes the new assistant director of Choeseon Academy and pays Hye-jin a visit. Joon-ho's friend Seung gyu is interested in Jeong-mi.
Joon-ho's mother makes an unexpected visit to his apartment. Two of Hye-jin's rivals conspire against her. Hye-jin and Joon-ho get into a huge fight in front of their colleagues.
Assistant Director Wu Seung Hui takes Hye-jin's teaching files and tries to use them against her. Pyo Sang Seob gives a free lecture. Hye-jin is persuaded to adapt her teaching techniques. Seung gyu and Jeong-mi start dating.
Hye-jin's rivals plot to destroy the academy and her reputation. Hye-jin's relationship is exposed, leading Joon-ho to tell his mother that he and Hye-jin are dating. Hye-jin realizes what she needs to be happy in life.
Rumors spread quickly to parents and teachers, and Hye-jin and Joon-ho deal with the fall-out. Hye-jin is upset by the parent's behavior, and Joon-ho rebels against harsh comments. The academy faces failure if the teachers leave.
Jun Ho confronts Seung Hui about the scandal involving Hye Jin. Hyun Tak worries about students leaving the academy. Seung Hui tries to sway instructors to her side, while Jun Ho aims to resolve the matter directly with her.
Instructors leave the academy. Seung Hui asks Min Jin to spy on Hye Jin in Choisun. Hye Jin confronts the schemer after learning the truth. Amidst struggles, she contemplates her aspirations.
