Episode 8 of "Bitch X Rich" kicks off with Si-eun steering Hye-in towards another Diamond Club member, Lee Duk-Min. Despite his wealth, Duk-min often exuded an aura that misled fellow students into believing he was destitute, making him a target of their bullying. Si-eun whispers to Hye-in that Duk-min could be her ticket to financial relief, prompting Hye-in to send him a text. He swiftly responds, summoning her to a room where he agrees to compensate her with 50,000 won in exchange for risqué photographs of herself.
Duk-min instructs Hye-in to don a fetching kitty costume, followed by a sexually charged student outfit, while he captures her in provocative poses. Just as Hye-in prepares to depart, Duk-min sweetens the deal by offering an additional 30,000 won if she disrobes from the costume and dons her school uniform in his presence. Driven by desperation, Hye-in acquiesces and strips before him.
Meanwhile, Do-eon pays a somber visit to Hae-in in the hospital, his mind drifting back to their heated exchange prior to her mishap. Their spat erupted when Do-eon attempted to shield Hae-in from Je-na's wrath, only to have Hae-in worry about intensifying Je-na's animosity towards her.
Do-eon ventures to the school to scrutinize the CCTV footage from the fateful night of Hae-in's accident, only to discover the files have vanished. His thoughts revert to Hye-in's sighting of a female student's silhouette on the rooftop, pondering which classmate could be implicated in the tragic incident.
Elsewhere, Woo-jin finds himself sharing dinner with Yul-hee. He tentatively broaches the subject of intimacy, only to learn that Yul-hee yearns to await marriage for their first time together. Woo-jin pretends to respect her wishes, though his deceit is palpable.
A sudden phone call interrupts their meal, prompting Woo-jin to berate the caller in fear that Je-na has uncovered his lie to Yul-hee. The following morning, Hye-in awakens from a harrowing nightmare revisiting Hae-in's accident. Haunting memories flood back—Hae-in snatching a necklace from her assailant's neck and pressing it into Hye-in's hands moments before plunging from the building.
In the present, Hye-in searches diligently through her drawers in search of the necklace, only to realize with a start that she had inadvertently forgotten about it. Meanwhile, Je-na witnesses a harrowing scene as her father's mistress, Professor Ha, strides confidently into Cheongdam International High School. Professor Ha, who shares camaraderie with Professor Kim, engages in a casual chat about her upcoming marriage to a wealthy benefactor. The revelation sends Je-na into a tailspin of shock, triggering a panic attack.
Professor Ha adopts a false semblance of kindness towards Je-na in Professor Kim's presence, but her mask slips once they are alone. She reveals her bold ambition of bearing a male heir to Mr. Baek's vast empire, stunning Je-na with her audacity. When Professor Ha scorns Je-na and demands respect, Hye-in arrives fortuitously to intervene. She firmly asks Professor Ha to depart and escorts a distraught Je-na to a secluded room to regain her composure.
Hye-in and Je-na's attempt to reconcile devolves into yet another spat, but Hye-in中断s the cycle by hurling the money she earned from the photoshoot with Duk-min in Je-na's face. She declares defiantly that she will neither vacate the school nor yield to Je-na's machinations, asserting that the true formidable entity is Hye-in herself, possessed of nothing left to lose. The pair eventually strike a tentative truce, vowing never to cross paths again.
With this newfound liberation, Hye-in redirects her focus towards academics, maintaining a discreet profile at school. However, Do-eon reappears, feigning their continued romance. He lures Hye-in to the rooftop, where he unveils a startling revelation: her father is attempting to suppress the truth behind Hae-in's mishap. He warns that Hee-seo is a menacing figure who would refuse to aid Hae-in in seeking justice. Do-eon pleads for her assistance, but Hye-in rejects his plea, leaving him to his thoughts. Just as she steps away, an anonymous text arrives, containing a chilling video of Hye-in disrobing in front of Duk-min, captured from an undisclosed vantage point. It becomes evident that a clandestine camera had been planted to film her ordeal.
Elsewhere, Yul-hee and Je-na are taken aback to see Si-eun in Hye-in's company. In class, Si-eun pens a note in Je-na's book, inquiring after her wellbeing. That evening, Hye-in finds herself at home, haunted by the menacing note she received at the mall. As she scrutinizes Si-eun's note, she detects a striking similarity in their handwriting styles, leading to a startling realization.
Hye-in is astounded to discover that Si-eun has been the anonymous tormentor all along. The episode culminates with Si-eun visiting Hae-in in the hospital, where she confesses her envy, bitter that Hae-in had succeeded in seducing Do-eon. As she exits the room, Si-eun cackles to herself, gleefully glancing at the incriminating video of Hye-in and Duk-min.
