SKY Castle

Han Seo-jin hosts a party for Lee Myeong-ju, who has seen three generations of doctors in her family. They gather under the pretense of offering congratulations, but their ulterior motives are soon exposed... Han Seo-jin attends a bank VVIP investment presentation, which is actually a front for a secret college entrance coordinator contest!

A single gunshot takes place at Sky Castle. The death of Lee Myeong-ju throws everybody into intense confusion and shock. Spring comes, and Lee Su-im's family moves to Sky Castle. Han Seo-jin expects that college entrance coordinator Kim Ju-yeong would provide a gold-paved road for her daughter Ye-seo, but discovers something she should not have...

Upon reading Yeong-jae's diary saved in the tablet PC, Han Seo-jin runs to Kim Ju-yeong and slaps her cheek, effectively ending her coordinator contract. After hearing about former resident Lee Myeong-ju's family story, Lee Su-im becomes concerned about the tragic ending. At the regular Sky Castle book meeting, Lee Su-im and Woo-ju come as new members, causing disruption...

Lee Su-im recognizes Han Seo-jin as her true self, Gwak Mi-hyang, and Han Seo-jin finds herself in a crisis of potentially being chased away from Sky Castle. Meanwhile, Cha Min-hyeok expects to win votes by a landslide at the poll deciding whether to maintain or abolish book club ‘Ompharos.'

Seo-jin encounters haggard Yeong-jae in front of Kim Ju-yeong's office, and instinctively feels that he is disturbed. Meanwhile, Su-im witnesses Ye-bin stealing at the convenience store, and ponders about how to help her. Seo-jin is bothered by Su-im's meddling. Seung-hye takes on a task to bring a great change for the sake of her two sons...

Jun-sang feels his heart drop when his first love Kim Eun-hye makes a call. Seo-jin finds Jun-sang suspicious. Seung-hye finally rebels against Min-hyeok's educational methods, and stops preparing luxurious meals for him, replacing them with ‘this.'

After reading Yeong-jae's tablet PC diary, Su-im and Ye-bin are shocked at the newly discovered dark side of him. Seo-jin lets Ye-bin in on another secret...Thinking that Yeong-jae's family tragedy is related to Ju-yeong, Su-im starts to investigate the incident, much to Seo-jin's discomfort.

Su-chang takes Ju-yeong away somewhere, and Seo-jin starts to follow them... Concerned about Ye-seo complaining about Hye-na and Woo-ju being her competitors in a school president election, Seo-jin tries to devise a way to make her daughter win... Su-im visits Ju-yeong thanks to Seung-hye's help, but would Su-im be able to extract information from Ju-yeong concerning the tragedy?

Hye-na is immensely shocked after hearing the truth behind her mother's long-kept secret. Later on, she approaches Ye-seo on purpose... Seo-jin invites people over to a school president election party in honor of Ye-seo. But the party is merely a front for her exposure of Su-im's novel based on the incidents at Sky Castle...

A Sky Castle plenary session is held against Su-im's novel composition, and Su-im is attacked by everyone. But two facts are exposed to the people's interest. Jun-sang learns that Min-hyeok can provide the base for him to become the Executive Director of the center.

Seo-jin takes Hye-na in as Ye-bin's resident tutor. Upon seeing Seo-jin's luxurious home, Hye-na makes a meaningful resolution... As her novel progresses, Su-im finds that she must include Yeong-jae's story, and visits Su-chang for permission. It is Christmas time at the castle, and Min-hyeok's favorite child and Harvard student Se-ri visits! Min-hyeok is ecstatic about his daughter's visit.

Seo-jin visibly shakes after realizing that Hye-na is Jun-sang's daughter, and becomes fearful that Hye-na could have entered her house on purpose... Su-im realizes that Ju-yeong has approached her intentionally, and decides to sound her out. Su-han disappears after saying, “Sorry for being born,” and Jin-hui searches through the whole Castle grounds to find him.

Seung-hye finds it hard to believe that Se-ri's admission to Harvard was a lie, but is more afraid that Min-hyeok would find out about it... Ye-seo and Hye-na clash more and more, and Seo-jin suffers emotionally while caught in the middle. She becomes resentful of Ju-yeong having made her bring Hye-na into her house...

Seo-jin becomes furious at Ju-yeong for making her take in Hye-na as a resident while knowing that she is Jun-sang's daughter. Ju-yeong takes advantage of the fact that Ye-seo is steadily relying on Ju-yeong more than her own mother. With no other option, Seo-jin turns to Su-im for help... Eventually, Min-hyeok discovers the truth about Se-ri's student life.

Hye-na suddenly falls to her death on the night of Woo-ju's 19th birthday, but why did she have to fall? Se-ri lives a new confident life as a club MD, but due to Min-hyeok's disapproval, the household hosts constant battles. The incident from the night before causes numerous unwelcome guests to visit Sky Castle. The four couples gather together to draw up a plan...

Seo-jin's heart drops after hearing from Ju-yeong that Ye-seo is involved in Hye-na's death. She finds herself caught between maternal affection and guilt... Woo-ju, who was emotionally distraught due to Hye-na's death, finds himself in a larger predicament... Only Ju-yeong is able to console an emotionally distressed Ye-seo, and Seo-jin finds herself helpless against how the events unravel...

Upon learning that Hye-na is his daughter, Jun-sang falls into despair regarding his past actions. After seeing their detained son Woo-ju growing steadily thinner, Su-im and Chi-yeong become more and more desperate to find the real culprit behind Hye-na's death.

Upon hearing from Seo-jin that Hye-na's death is connected to Ju-yeong, Jun-sang rushes to Ju-yeong in a blind fury... Ye-seo finds it difficult to rely on Ju-yeong as much as she used to, and struggles emotionally against the feelings of guilt. Tired of Min-hyeok's educational principle, Seung-hye gathers the family together to deliver an ultimatum...

The tension between Seo-jin and Ju-yeong grows extremely high after Ju-yeong hands over Sinah High's exam papers to Seo-jin. Seung-hye and her children do not return home, and Min-hyeok's life style deteriorates in quality. Min-hyeok visits the children, only to turn back after hearing shocking words... Ju-yeong enters her daughter Kay's room for the first time after cooking a meal for her...

Ju-yeong's words pierce deep into Seo-jin's heart, prompting her to remember her past actions and feel deep guilt... Woo-ju makes an important announcement to his family, and Su-im and Chi-yeong find his decision shocking. "Goodbye, Sky Castle!" Even after some leave, the Castle stands still where it always was, waiting for its next residents.