In the Joseon Dynasty, two friends who grew up together — one the master and one the servant — reunite post-war as enemies on opposing sides.

Haunted by past wounds from her parents, Seo-young suffers from tinnitus and vertigo which started when she had moved to her new office in the sky a few months ago….

A woman’s life is turned upside-down when a dangerous man gets a hold of her lost cell phone and uses it to track her every move.