Haunted by past scars from her parents, Seo-young suffers from tinnitus and vertigo after moving to her new office in the sky a few months ago. Seo-young and Jin-su, the development team manager, are covertly dating, but a provocation makes them vulnerable. Gwan-woo climbs a 70-story building after the loss of his sister. When Gwan-woo cleans windows on ropes at Landmark Tower, Seo-young watches him in wonder.