Popular horror streamer Han-byul with 500K subscribers receives a mysterious donation with a location recommendation: an abandoned psychiatric hospital on the outskirts of Seoul, closed 30 years ago after an unexplained fire. Confident of high viewership, Han-byul and three staff begin a nighttime live broadcast. Viewers surge with the eerie atmosphere, but everything changes upon entering the 3rd floor isolation ward. Inexplicable figures appear on camera, equipment malfunctions, and a staff member vanishes. The exits are locked. Anonymous tips in the chat reveal inhumane experiments conducted 30 years ago. The broadcast can't stop, something is approaching from deep within the building, and nobody can predict the ending of this stream that surpasses 1 million viewers.
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