Season 1

1. Episode #1.1 ⭐ 9.4

04 Nov, 2021 · 33 votes

With new ambitions for Asung High School, Noh Jung-ah hires Ji Yoon-su to lead an advanced math program. A controversial placement test is administered.

Director: Sang-hyub Kim

Watch Episode 1

2. Episode #1.2 ⭐ 9.2

11 Nov, 2021 · 25 votes

Asung High holds a competition to select a representative for the International Mathematical Olympiad. Yoon-su calls Paik Seung-yoo to detention.

Director: Sang-hyub Kim

Watch Episode 2

3. Episode #1.3 ⭐ 9.2

17 Nov, 2021 · 23 votes

The results do not go according to plan for some. Jung-ah grows uncomfortable with Yoon-su's unwillingness to comply with the school culture.

Director: Sang-hyub Kim

Watch Episode 3

4. Episode #1.4 ⭐ 9.5

18 Nov, 2021 · 25 votes

Threatened by Seung-yoo's rise, a malicious rumor begins to spread. Yoon-su learns the real reason why the IMO Speech Competition is happening.

Director: Sang-hyub Kim

Watch Episode 4

5. Episode #1.5 ⭐ 9.3

24 Nov, 2021 · 20 votes

The success of Asung High's students at I.M.O. attracts attention and controversy. Yoon-su tries to set things right, but finds that she may be too late.

Director: Sang-hyub Kim

Watch Episode 5

6. Episode #1.6 ⭐ 9.2

25 Nov, 2021 · 20 votes

Yoon-su distances herself from Seung-yoo. Sung Ye-lin prepares for midterms as usual, but this time something doesn't add up.

Director: Sang-hyub Kim

Watch Episode 6

7. Episode #1.7 ⭐ 9.2

01 Dec, 2021 · 19 votes

Years later, Seung-yoo tours the country while giving lectures and interviews as a celebrated mathematician. He meets an attendee with a familiar nickname.

Director: Sang-hyub Kim

Watch Episode 7

8. Episode #1.8 ⭐ 9.3

02 Dec, 2021 · 21 votes

Jung-ah tries to get her daughter to see a reputable, but secretive, tutor. Seung-yoo invites his students to participate in his newest project.

Director: Sang-hyub Kim

Watch Episode 8

9. Episode #1.9 ⭐ 9.2

08 Dec, 2021 · 19 votes

Seung-yoo offers his help to Yoon-su who is gathering evidence to expose the inner workings of Asung High, but she refuses to have anything to do with him.

Director: Sang-hyub Kim

Watch Episode 9

10. Episode #1.10 ⭐ 9.2

09 Dec, 2021 · 19 votes

A teacher gets arrested. Seung-yoo finds out who spread the rumor four years earlier. Choi Si-an finds someone to help her solve a difficult math problem.

Director: Sang-hyub Kim

Watch Episode 10

11. Episode #1.11 ⭐ 9.1

15 Dec, 2021 · 17 votes

To become director of the Asung Foundation, Jung-ah uses Seung-yoo to her advantage, while Noh Yeon-wu turns an enemy into an ally.

Director: Sang-hyub Kim

Watch Episode 11

12. Episode #1.12 ⭐ 8.5

16 Dec, 2021 · 17 votes

An old scandal surfaces back into the spotlight. Yoon-su worries that Seung-yoo may be jeopardizing his future by confronting the past.

Director: Sang-hyub Kim

Watch Episode 12

13. Episode #1.13 ⭐ 9.1

22 Dec, 2021 · 17 votes

When accusations come in from all sides, Jung-ah fights back. Yoon-su enjoys a relaxing time with Seung-yoo before her final goodbye.

Director: Sang-hyub Kim

Watch Episode 13

14. Episode #1.14 ⭐ 9

23 Dec, 2021 · 16 votes

To keep the police from digging any deeper, Jung-ah appoints a fall guy. Si-an finds something suspicious in Kim Ji-na's bag.

Director: Sang-hyub Kim

Watch Episode 14

15. Episode #1.15 ⭐ 9.1

29 Dec, 2021 · 17 votes

While Jung-ah scrambles to contain the secrets and lies, Seung-yoo and Yoon-su urge witnesses to come forward. Asung High's days are numbered.

Director: Sang-hyub Kim

Watch Episode 15

16. Episode #1.16 ⭐ 8.8

30 Dec, 2021 · 21 votes

Knowing that Jung-ah's influence is far-reaching, Yoon-su chooses a different way to expose the truth. Seung-yoo invites a friend to come out of hiding.

Director: Sang-hyub Kim

Watch Episode 16