Olivia Sazon (Carmina Villarroel) is a mother who is desperate to find help for her terminally-ill daughter.
As she takes on a demanding job at a call center in an old building in Manila, Olivia begins to experience a series of strange events that creep into her personal life.
And when the events start to affect her daughter's behavior, Olivia is forced to uncover the mystery that lies within the call center walls...but what's waiting for her inside may be more sinister than she ever expected展开