Being of Problem

Sejin, a university student, is being scolded by her seniors in a library stairwell one night. Then the lights go out with a "hwoo-" electric signal, and the seniors twist into grotesque beings, spilling black sludge. In the chaos, her boyfriend Hojun—wearing a military uniform—appears, hides Sejin in a restroom, and says he crossed over from another dimension to save her. Now Sejin is pulled into the nightmare of this strange nigh