Yeong-jae is accepted into a top medical school and his mother becomes the envy of the other mothers, who all want to know exactly how she managed it.

While everyone is still dealing with the shock of what happened, a new family whose values and background seem very different move into Sky Castle.

The entrance exam coordinator is confronted; Lee Su-im checks out the Sky Castle reading group, but it is not what she expected.

Cha Min-hyeok feels confident about the upcoming vote; Seo-jin will do anything to help Ye-seo, even if that means hitting new lows.

Seo-jin attempts to talk to Yeong-jae; Su-im wonders what to do about Ye-bin; No Seung-hye and Min-hyeok scramble to formulate another plan.

Seung-hye challenges Min-hyeok face to face; Seo-jin believes that she's fixed things; Ye-bin discovers an unlikely confidante.