S01E01 Fermat’s Last Theorem
At Asung High, Yoon Su’s new workplace, she gives a tricky question for students who want to join the math club. While no one in the class got the question right, a correct answer sheet...
Melancholia
S01E06: The Midterms
Yoon Su gets overwhelmed with mixed and complex emotions after hearing Seung Yoo profess his love for her. Gyu Yeung notices Seung Yoo's love for Yoon Su and uses it to blackmail him. Meanwhile, Yu Hye Mi takes things into her hands for the midterms Ye Rin is about to face. However, Yoon Su finds something suspicious in Ye Rin's midterm answer sheet.
Overview
A sexual scandal between a math teacher and a student in a prestigious high school ended in tragedy. 4 years later they meet again, now as adults, to reveal the corruptions in school and to regain one's reputation as a teacher.
Episodes
S01E02 Baek Min Jae
Yoon Su finds out that Seung Yoo solved the question. But he tries to keep a distance from her, saying he doesn’t like math. Yoon Su gives him another math problem, and the problem allows...
S01E03 Infinite and Finite
Seung Yoo participates in the math competition and is picked to represent Asung High along with Ye Rin. The result shocks everyone who thought Seung Yoo had no talent in math except for Ye Rin...
S01E04 The Ten-Year-Old Genius
Seung Yoo and Ye Rin prepare in earnest for the Math Olympics. Jung Ah and Min Jun teach Ye Rin the means to win, and Yoon Su finds out about the corruption in the competition....
S01E05 Faulty Brakes
After the Math Olympics, Seung Yoo opens up and tells Yoon Su the traumatic experience he had bottled up inside of him for a long time. Yoon Su comforts him and sympathizes with Seung Yoo's...
S01E06 The Midterms
Yoon Su gets overwhelmed with mixed and complex emotions after hearing Seung Yoo profess his love for her. Gyu Yeung notices Seung Yoo's love for Yoon Su and uses it to blackmail him. Meanwhile, Yu...
S01E07 Seung Yoo Returns
After four years, Seung Yoo has now become a renowned mathematician, and he returns to look for traces of Yoon Su who has disappeared after the incident in 2017. Meanwhile, Principal Noh Jung Ah of...
S01E08 Seung Yoo’s Project
Now that he has reunited with Yoon Su, Seung Yoo tries to get close to her again. Noh Jung Ah, who doesn't know that Yoon Su has become an elite instructor at an academy, asks...
S01E09 Unlocking Yoon Su’s Heart
Seung Yoo tries to bring Yoon Su out into the world from her rut by getting close to her heart, just the way she helped him. Meanwhile, Yoon Su keeps her identity hidden while collecting...
S01E10 The Audit
For the first time, Yoon Su reveals to Seung Yoo her pain and suffering. Seung Yoo discovers the person behind their love scandal and proposes they stand together and fight. Meanwhile, Ye Rin ends up...
S01E11 Face to Face at Last
Yoon Su starts to smile little by little thanks to Seung Yoo, and the two of them have an enjoyable and memorable time together. Meanwhile, Noh Jung Ah, who is furious at Yoon Su for...
S01E12 Flawed Premise
Seung Yoo announces that he was the student involved in the teacher-student love scandal at Asung High and shocks everyone that it was all a setup. Yoon Su doesn't want to jeopardize Seung Yoo any...
S01E13 A Place Of Warmth
Seung Yoo understands the error in the premise and Yoon Su deeply. He becomes frustrated because his love for Yoon Su obstructs any means of proving Yoon Su's innocence. To comfort him, Yoon Su takes...
S01E14 Asung’s New Director
Seung Yoo and Yoon Su finally reveal the truth behind the scandal that happened in their past. While Noh Jung Ah puts forward a scapegoat after getting cornered, Ye Rin begins to crumble in her...
S01E15 Ji Na’s Guilt
Yoon Su and Seung Yoo hold hands for Si An, supporting, relying on, and moving together. In the end, they get close to exposing that Si An's condition was the cause of what went behind...
S01E16 Noh Jung Ah’s Collapse
Finally, Seung Yoo and Yoon Su reveal the secrets behind Asung Academy and Noh Jung Ah to the world. How will Noh Jung Ah's defeat look? What will become of Seung Yoo and Yoon Su's...
Cast
Lim Soo-jung
Ji Yoon-soo
Lee Do-hyun
Baek Seung-yoo
Jin Kyung
Noh Jung-ah
Woo Da-vi
Sung Ye-rin
Jang Hyun-sung
Sung Min-joon
Byeon Jung-su
Yoo Hye-mi
Choi Dae-hoon
Ryu Sung-jae
Baek Ji-won
Min Hee-seung
Kim Ho-jin
Baek Min-shik
Jeon Guk-hyang
Shin Kyung-in
Oh Hye-won
Noh Yeon-woo
Lee Kang-ji
Lee Hyun-jae
