A few months ago, Seo-young moved into a new office in the sky, but she has been plagued with tinnitus and vertigo ever since. Seo-young is secretly dating Jin-su, the manager of the development team, but their relationship is weakened when Jin-su is unexpectedly provoked. Gwan-woo, who has lost his only sibling, uses ropes to circumnavigate a 70-story building. Gwan-woo becomes interested in Seo-young when she watches him in admiration as he cleans windows from a rope at Landmark Tower.