Episode 1
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...
Episode 2
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 vi...
Episode 3
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 s...
Episode 4
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 t...
Episode 5
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...
Episode 6
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 wo...
Episode 7
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 s...
Episode 8
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 t...
Episode 9
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 w...
Episode 10
Emotion, the Variable That Alters Relationships
A public revelation leaves Haeng-seon and Chi-yeol's relationship in limbo. Meanwhile, Chi-yeol faces the repe...
Episode 11
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 n...
Episode 12
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 d...
Episode 13
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 catc...
Episode 14
Find the Unique Solution
News about Hae-e leaves those around her feeling rattled. Haeng-seon begins to suspect something's off. Chi-ye...
Episode 15
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...
Episode 16
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 pivota...