Seo-young has tinnitus and vertigo, which started when she moved to her new office in the sky a few months ago. These are symptoms of old wounds from her parents. Seo-young and Jin-su, the manager of the development team, are dating in secret, but an unexpected event makes Seo-young vulnerable. Gwan-woo uses ropes to get around a 70-story building after the death of his only sister. One day, Gwan-woo is cleaning windows on ropes at Landmark Tower when he notices Seo-young watching him with amazement from the other side.