The Butterfly Mansion is called “the most haunting building in Taipei.” However, many people still choose to reside because of the cheap rents, forming a complicated environment. It is thus covered in a dread atmosphere and becomes a suicide hotspot.
CHEN Wei, along with her daughter, seeks refuge from her violent husband by moving into the Butterfly Mansion. She soon learns the stories and the forbidden door of Room 613. Later, CHEN Wei discovers the strange behaviors of her neighbors and her daughter. The eerie feeling terrifies her until a substitute superintendent, Xiao Liang, walks into her life. However, as the Chinese ghost month unfolds, the worlds of the dead and the living connect. The opening of the forbidden door of Room 613 is about to intertwine more unexpected and supernatural horror events within the Butterfly Mansion. CHEN Wei, meanwhile, is getting herself involved in a greater crisis.