S01:E09 - Episode 9
S01:E01 - Episode 1
Ji Yoon-soo, math teacher, set to marry, assigned to prestigious Asung High School in Gangnam.
S01:E02 - Episode 2
Yoon-Soo realizes that Seung-Yu is the one who guessed the math club's Calculus question.
S01:E03 - Episode 3
When Yerin learns that Seung-yu used to be a math prodigy, she feels uneasy.
S01:E04 - Episode 4
Seung-Yu and Yerin start preparing for the Math Olympics in earnest.
S01:E05 - Episode 5
Seung-Yu opens up to Yoon-Soo about a past trauma she hasn't been able to tell anyone about.
S01:E06 - Episode 6
Yoon-soo has mixed feelings about Seung-yoo's confession.
S01:E07 - Episode 7
Four years later, Seung-yu has become a renowned mathematician.
S01:E08 - Episode 8
Finally reunited with Yoon-Soo, Seung-Yu hovers by her side and tries to get closer.
S01:E09 - Episode 9
Seung-yu tries to get Yoon-soo to come out of his shell, just like he did for her.
S01:E10 - Episode 10
For the first time, Yoon-soo opens up to Seung-yu about her pain and hurt.
S01:E11 - Episode 11
Thanks to Seung-yu, Yoon-soo finds a little bit of laughter, and the two share a special moment.
S01:E12 - Episode 12
Seung-yu said that he was the subject of the Asung High School scandal and that it was a frame-up.
S01:E13 - Episode 13
He is frustrated that his love may be an obstacle to proving Yoon-soo's innocence.
S01:E14 - Episode 14
Seung-yu and Yoon-soo are finally able to reveal the truth about their past scandals.
S01:E15 - Episode 15
Eventually, they realize that Sian has been victimized by corruption in the school.
S01:E16 - Episode 16
The secrets of Aseong High School and Noh Jung-ah are finally revealed to the world.
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