The news of Yeong-jae’s acceptance into a leading medical school sparked a quiet envy among the other mothers. They sought her out, a collective curiosity in their eyes, eager to understand the secret of his achievement.

Even as the echoes of the recent upheaval still reverberate, a new family, their origins and principles strikingly distinct, takes up residence in Sky Castle.

Han Seo-jin faced the entrance examination coordinator. Meanwhile, Lee Su-im found herself immersed in the Sky Castle reading group, an experience far removed from her initial expectations.

A palpable tension hangs over Sky Castle as the vote approaches, yet Cha Min-hyeok remains assured. He believes Seo-jin will go to any length for Ye-seo, compromising as far as the situation demands.

Seo-jin encountered Yeong-jae and attempted to speak with him. Su-im considered her options regarding Ye-bin. Meanwhile, Seung-hye and Min-hyeok worked quickly to devise an alternative course of action.

Seung-hye confronts Min-hyeok directly. Seo-jin believes she has resolved matters, yet neglects to consider Kang Jun-sang. Ye-bin discovers an unexpected source of support.

The discovery left Su-im and Ye-bin utterly astonished. Seung-hye and Su-im exchanged uneasy glances, lost in speculation about Yeong-jae and his family. Meanwhile, Kim Ju-yeong offered a sharp rebuke to Ye-seo.

Kim Hye-na and Hwang U-ju are the frontrunners in the school election, yet Seo-jin conspires with Min-hyeok to guarantee their children's victory.

Kang Jun-sang found a perverse pleasure in Seo-jin's proposal for a dinner, envisioning it as an opportunity to subtly boast about their own happiness in comparison to the other couples. However, the evening took a sharp turn when the conve…

Seo-jin’s response infuriated Kim Ju-yeong, and she spearheaded an attack on Su-im, though her recklessness would prove costly in ways she hadn't foreseen.

Reluctantly, Seo-jin agrees to have Hye-na move in as Ye-bin’s tutor, a decision that leads to a surprising revelation. Meanwhile, Su-im seeks out Yeong-jae’s father, determined to understand the events from his perspective.

A curious detail concerning Kim Ju-yeong reached Su-im's ears. In the room, Seo-jin's anger finally erupted. Min-hyeok listened to his daughter's tales with quiet delight, though Seung-hye perceived something subtly amiss.

The weight of Se-ri's past in Cambridge presses down on Seung-hye, and she dreads the consequences should Min-hyeok discover it. Meanwhile, Su-im receives a summons from Yeong-jae.

Seo-jin fiercely rebukes Kim Ju-yeong, only to find herself overwhelmed by the sheer audacity of her own daughter's defiance. Meanwhile, Seung-hye contemplates the path she has forged and finally asserts herself.

Hye-na was rushed to the hospital, yet Jun-sang instructed Hwang Chi-yeong to perform surgery on a different patient. Meanwhile, Seo-jin inquired of Ye-seo about her actions at the party.

Seo-jin, heedless of the potential cost to U-ju, implores Kim Ju-yeong to spare her daughter's life, while Ye-seo steadfastly maintains his innocence. Su-im, however, suspects a darker purpose at play.

Jun-sang voiced his disapproval of Seo-jin and his mother concerning Hye-na. Seo-jin, in turn, spoke sharply of Kim Ju-yeong, though her thoughts remained fixed on Ye-seo's prospects.

Jun-sang is determined to report to the authorities and clear U-ju's name, but Seo-jin resists his efforts. Meanwhile, Seung-hye is unwilling to continue living with Min-hyeok, a sentiment echoed by their children.

Su-im implored Seo-jin, but the latter remained resolute. Ye-bin voiced her feelings to her mother. U-ju questioned why forgiveness should be extended to Seo-jin.

U-ju has announced his departure from his studies. Jun-sang has resigned from his position, and Seo-jin is preparing to leave Sky Castle. Seung-hye has achieved a significant victory, and Su-im's book is now available to the public.