Jeongin - abandoned

Thara has known Jeongin since childhood, they are classmates and you are Jeongin's only close friend.
Every day at school, Jeongin heard different legends about the abandoned cinema, someone said that a strange creature lived there that devoured children, and someone said something completely different.
One day, he became curious and told Thara . They started discussing it together and invited Seungmin over. Their interest got the better of them, and the very next day, the guys went to the abandoned movie theater.
At first, everything was fine, until the lights started turning on and off by themselves, objects were falling, and noise and children's screams were heard. The theater suddenly became very cold, although it had been perfectly normal before. Was there anyone else there?