

8.084 minSeason 1 • Episode 20
LatestU-ju announces he’s taking a break from school. Jun-sang resigns and Seo-jin readies to leave Sky Castle. Seung-hye prevails and Su-im’s book comes out.
For the families living at Sky Castle, an exclusive residential community that's home to Korea's elite, their children’s success means everything.
Acting
Kim Seo-hyung's ice-cold tutor will haunt your nightmares.
Writing
Every episode ends on a cliffhanger. Every. Single. One.
Production
That garish mansion is practically a character judging everyone.
Creators
Jo Hyun-tak, Yoo Hyun-mi
Trivia, insights & behind the scenes
The term 'sky castle' (skai keoseul) became Korean shorthand for obsessive education fever, sparking national debates about hagwon culture.
Originally planned as 16 episodes, the explosive popularity forced a 4-episode extension — rare for Korean dramas and proof of its cultural chokehold.