Kaun Hai? S01 E27 Stree visits a haunted studio

Rajkummar Rao and Shraddha Kapoor, stars of the film Stree visit Nandini, a budding actress. But little do they know that Nandini's studio has a sinister reputation. Soon enough, Nandini gets trapped in it and falls victim to a malevolent spirit. What is the story behind this haunted studio?