Famous star instructor Seo Hye-jin works until midnight at the academy like any other day. As she stares at the Hall of Fame in the lobby, Joon-ho's name catches her eye. He is one of her proud boast as she did her best to teach him, and he made it into a prestigious university. At the same time, Joon-ho decides to resign from his company and make a new beginning as a rookie instructor.

Even though Hye-jin tries to dissuade Joon-ho, he already passed the first written exam and is getting ready for the test lecture. Therefore, Hye-jin privately asks Ji-seok to disapprove of him. Meanwhile, Sang-sub, the Korean language teacher at Chanyoung High, makes a declaration that creates huge confusion among the students and academies.

A clandestine endeavour dubbed "Teacher and Student Sally Forth" sparks a covert tutoring session led solely by Hye-jin for Joon-ho. Alone in an office after hours, they exchange determined gazes as they delve into a specialized lesson. Meanwhile, the renowned Director Choi, also known as the White Haired Witch, sets her sights on expanding her academy.

Hye-jin and Joon-ho's optimism for their collaborative lecture fades as they discover only one student has attended their free session. Shocked, Hye-jin collapses emotionally while Joon-ho supports her in regaining composure. They soon learn of a tactic by Choi Sun Academy to dissuade students from considering switching, but the lone attendee might just potentially change the game.

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