S01E01 You and I, the Intersection of Two Universes
As competition in her class ramps up, Nam Hae-e anxiously awaits her math score. Choi Chi-yeol is embroiled in a scandal involving one of his students.
Crash Course in Romance
S01E04: Revolt of the Arithmetic Sequence
Haeng-seon gets a taste of the vicious politics among the academy's parents. She later goes to great lengths to make things right for Hae-e.
Overview
The series follows the bittersweet relationship between a banchan shop owner whose daughter enters the war of Korea's college entrance exams, and a top hagwon instructor.
Episodes
S01E02 Probability of Encountering Your Enemy at Your Worst
Nam Haeng-seon attempts to register Hae-e into The Pride Academy. Desperate for Haeng-seon's food, Chi-yeol visits her store in a disguise.
S01E03 Number of Outcomes Where Dislike Becomes Like
Haeng-seon begins fawning over Chi-yeol after discovering his true identity. A change in the Pride Academy's schedule creates a stir among the parents.
S01E04 Revolt of the Arithmetic Sequence
Haeng-seon gets a taste of the vicious politics among the academy's parents. She later goes to great lengths to make things right for Hae-e.
S01E05 The Secret Probability Distribution of X and Y
Haeng-seon and Chi-yeol work out an arrangement for Hae-e's tutoring. A mysterious tragedy leaves the academy and its parents rattled.
S01E06 There Are No Correct Answers in Life, Only Best Answers
A painful past comes back to haunt Chi-yeol. Bang Su-a becomes suspicious of Hae-e after finding her secret worksheets on her desk.
S01E07 The Very Average Laws of Attraction
Hae-e ranks first in her class, causing drama among other parents. Chi-yeol and Haeng-seon grow closer as he spends more time with her family.
S01E08 Chance Becomes Fate through Inductive Reasoning
Haeng-seon realizes her own feelings after seeing Chi-yeol at the academy. Su-a connects the dots and begins to make sense of Hae-e's recent successes.
S01E09 The Butterfly Effect of Our Relationship
Chi-yeol and Haeng-seon deal with the fallout after their secret is discovered — forcing the two to confront what it means for them moving forward.
S01E10 Emotion, the Variable That Alters Relationships
A public revelation leaves Haeng-seon and Chi-yeol's relationship in limbo. Meanwhile, Chi-yeol faces the repercussions of recent events.
S01E11 The Functional Relationship of Our Love
Tired of her loved ones facing scrutiny, Hae-e makes a bold confession to the world. Haeng-seon and Chi-yeol navigate their road ahead post-scandal.
S01E12 Point of Intersection between Comedy and Tragedy
A shocking arrest leaves the academy's parents — and Hae-e — concerned. Haeng-seon and Chi-yeol maneuver the days after their first fight.
S01E13 How We Approach an Unsolvable Conjecture
Hae-e attempts to get a hold of Lee Sun-jae after being put in a difficult position at school. Haeng-seon catches Ji Dong-hui in a hostile moment.
S01E14 Find the Unique Solution
News about Hae-e leaves those around her feeling rattled. Haeng-seon begins to suspect something's off. Chi-yeol confronts Dong-hui about his behavior.
S01E15 The Result of Chance and Inevitability
Lee Sun-jae's confession ignites a scandal at the school. Chi-yeol attempts to put an end to Dong-hui's scheme before it's too late.
S01E16 You and I, the Union of Two Universes
Grappling with her mother's return, Hae-e announces a shocking decision. Haeng-seon and Chi-yeol make a pivotal choice about their future.
Cast
Jeon Do-yeon
Nam Haeng-seon
Jung Kyung-ho
Choi Chi-yeol
Lee Bong-ryeon
Kim Yeong-ju
Oh Eui-sik
Nam Jae-woo
Shin Jae-ha
Ji Dong-hui
Roh Yoon-seo
Nam Hae-e
Jang Young-nam
Jang Seo-jin
Kim Sun-young
Cho Su-hui
Hwang Bo-ra
Lee Mi-ok
Heo Jeong-do
Kang Jun-sang
Lee Chae-min
Lee Sun-jae
Kang Na-eon
Bang Su-a
