Episode 3 of "Bitch X Rich" unfolds with a poignant flashback to the day Je-na's bullying scandal came under scrutiny. Je-na's henchmen, emboldened by their leader's wrath, unleash their fury on the downtrodden students of Cheongdam High, targeting those who dared to expose Je-na's bullying antics. Je-na, furious that her lackeys have failed to uncover the whistleblower, metes out punishment by forcing them to plunge into the school pool.
Among the scholarship students enduring this harassment is Kim Hae-in, who had previously aided Hye-in. Je-na, in a moment of callousness, informs these financially disadvantaged students that their poverty is their own doing and the root cause of their bullying. Later that evening, a student, unable to withstand the pressure, takes the fall for lodging the complaint against Je-na. With a heavy heart, he gathers his belongings and exits the school gates, despite Hae-in's pleading for him to persevere. The student insists that Cheongdam High is not a place for the likes of him. Ironically, it transpires that Hae-in herself was the one who had filed the complaint, leading to her own ordeal at the hands of Je-na's cronies.
The following day, in a chance encounter in the girls' restroom, Hae-in crosses paths with Hye-in for the first time, and a bond of solidarity forms as they offer mutual support. Unable to stomach the insulting remarks hurled by Na-yeon, Hye-in storms into the school, disrupting Na-yeon's selection interview and encountering Je-na face-to-face for the very first time.
Elsewhere, on the rooftop, Do-eon, a privileged student, encounters So-mang. So-mang mocks Do-eon for being a product of privilege, revealing that his stint as a volunteer was a result of being caught smoking. In retaliation, Do-eon summons security, alerting them to So-mang's presence on the rooftop before departing. So-mang scampers back to his post at the volunteer station just in time, where Hye-in, armed with a bucket of water, appears inquiring about the selection interviews. With So-mang and another volunteer guiding her, Hye-in bursts into the interview room, much to So-mang's astonishment. In a dramatic turn of events, Hye-in disrupts the interview by drenching Na-yeon with water, causing a scene that stirs the atmosphere.
Na-yeon's mother storms into the school, unleashing a fury of blows upon Hye-in. In response, the school president swiftly expels Na-yeon and bars her from ever attending Cheongdam International School again. Determined to teach Hye-in a harsh lesson, Na-yeon's mother shows no remorse. Later that day, Hye-in's teacher delivers devastating news: she is being sued for using a false identity to tutor Na-yeon.
Hye-in is devastated by the arrogant behavior of the wealthy student. Soon, her classmates turn against her, spreading rumors and bullying her for her alleged lies about her financial status. Meanwhile, Je-na's friends show her a picture of Hye-in donning the prestigious Cheongdam International School uniform, fueling further speculation.
Feeling overwhelmed, Hye-in deactivates her social media account and flees the school to confront Seo Hee-seo, the director of Cheongdam International School. She pleads with him to readmit Na-yeon and apologizes for her mistake, but Hee-seo remains unyielding. He insists that enrolling another affluent student into a school already brimming with wealth would benefit him in no way. Dismissing her request, Hee-seo orders her to be escorted off the premises, but Hye-in requests a quick visit to the restroom.
Inside the women's restroom, tears stream down Hye-in's face as she encounters So-mang, who is smoking there. So-mang reveals that the restroom has been out of use ever since a student gave birth there. They strike up a brief conversation, and instead of heading straight home, Hye-in decides to wait for Hee-seo to depart so she can try talking to him again.
So-mang informs Hye-in that the red Porsche parked outside belongs to Hee-seo, prompting her to stake out the parking lot in hopes of catching him. She waits patiently until 2:30 am that night, but Hee-seo has already left in a different vehicle.
As Hye-in makes her way back home, she is startled by a loud thud – Hae-in has fallen off the rooftop. Hye-in gazes upward, where she spots the shadowy figure who forced Hae-in to take such a drastic leap, leaving the episode on a cliffhanger as the truth behind the tragedy begins to unravel.
