Jung Ji-Woo works for a large corporation. She has feelings for her co-worker Jung Ji-Hoo, but she hasn't expressed to him how she feels. One day, Jung Ji-Woo receives a package. The package was intended for her co-worker Jung Ji-Hoo, but the delivery was mixed up due to their similar names. When Jung Ji-Woo opens the package, she sees a dog leash in the box. At that time, Jung Ji-Hoo runs over and tells her that it is his package. The dog leash is intended for S&M use and belongs to Jung Ji-Hoo. He tells Jung Ji-Woo about his S&M fetish and his interest in playing a submissive role. Jung Ji-Woo does not pass judgement on Jung Ji-Hoo, which touches Jung Ji-Hoo. He asks Jung Ji-Woo if she would become his master. Jung Ji-Woo accepts and they promise to have a temporary three month relationship with Jung Ji-Woo becoming his master.