When Yeong-jae gets accepted into a top medical school, his mother becomes the envy of the other mothers, who all want to know just 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.

Han Seo-jin confronts the entrance exam coordinator. Lee Su-im joins the Sky Castle reading group, but it's nothing like what she expected it to be.

Sky Castle is abuzz about the pending vote but Cha Min-hyeok is confident. Seo-jin will do anything for Ye-seo, and stoop as low as deemed necessary.

Seo-jin runs into Yeong-jae and tries to talk to him. Su-im ponders what to do about Ye-bin. No Seung-hye and Min-hyeok scramble to formulate a plan B.

Seung-hye challenges Min-hyeok head on. Seo-jin thinks that she's fixed things but doesn't count on Kang Jun-sang. Ye-bin finds an unlikely confidante.