El romance de medianoche en Hagwon

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.

Despite Hye-jin's efforts to dissuade Jun-ho, he successfully passed the first written exam and was preparing for his test lecture. Determined, Hye-jin secretly approached Ji-seok, asking him to reject Jun-ho's application.

In a secret initiative called "Teacher and Student Unite," Hye-jin conducts a private tutoring session for Jun-ho late at night. In the quiet office, their focused gazes meet as they dive into an intense lesson. Meanwhile, the formidable Director Choi, nicknamed the White-Haired Witch, begins planning the expansion of her academy.

Hye-jin and Jun-ho's excitement for their joint lecture turns to dismay when only one student shows up for the free session. Devastated, Hye-jin breaks down, but Jun-ho helps her regain her composure. They soon uncover Choisun Academy’s scheme to discourage students from switching academies—yet the sole attendee might hold the key to turning the tide.

Director Choi Hyung-sun, known as the White-Haired Witch, discovers that Hye-jin and Jun-ho held their lecture despite having only one student. She meets with Si-woo, the sole attendee, to ask about the session and whether he plans to switch academies. After hearing his thoughts, she reaches out to Hye-jin for a meeting.

Jun-ho discovers that Hye-jin has been secretly helping him at her own expense. Determined to handle things on his own, he tells her he doesn’t need her assistance anymore, leaving Hye-jin unsettled by his unexpected attitude. Meanwhile, the new class launches, and Director Kim finds himself in an awkward situation as his attempt to demote Hye-jin backfires.